If you had my lived experience, you would think differently.
To be clear I'm just working with what you've written out so far, which with this little of information doesn't build enough of a case on it's own for me.
It is just as possible that you are calling quirks full blown disorderly behavior just as much as you underreporting the severity of the issues, for all I know you might not be over the things you claim to have recovered from and I don't really have any way to prove it from here.
My depression was not chronic, from what it sounds like? It wasn't. I don't have depression anymore, so clearly it wasn't chronic. But it was definitionally not chronic. I'm just saying that, at the time, if you had evaluated me, without the wisdom of hindsight, my condition would have been indistinguishable from what you call "chronic depression".
Hard to know when that's not the you I'm seeing, especially when you don't want to take Neurochemistry into account. To me it sounds like the classic "fast person in the slow lane" problem, which can to many resemble disorders if they otherwise lack context. It very much reads to me so far as hyperactivity with down moments, even down to the "I was not challenged by my environment until I noticed it trying to" issue. Depression in the more mood swingy sort by comparison is more of a recharge than a permanent state of being, and chronic depression is with them through everything, while yours sounded more contextually based.
Depression tends to display itself as exhausted and withdrawn, which is how even Insomnia for example can come across as a false positive. Even a case of Bipolar I've seen was logged as simple Depression over how he did not ever come to their doctor in a manic state, lending to him being prescribed antidepressants that made everything worse.
In fact, I have major qualms with the way that modern psychiatry deals with mental illnesses. They've essentially elevated mental imperatives to the level of biological imperatives. I'm saying that there's no need to do that, and that there is no evidence that almost any of these chronic mental illnesses are actually chronic at all, with the exception of a few.
Do you figure people with chronic depression, the thing you don't have, just aren't trying?
Would you say that Buddha and that guy Paulo Coelho was actually just ADHD, too, along with everyone else who thinks they've awakened?
I would have to meet Buddha to know, but his life to me sounds like one of an escapist. He ran away from his responsibilities towards the very thing his father was trying to keep away from him, and had his father instead tried to force him to become a Holy Man we'd likely be talking about what kind of King Buddha was instead.
I don't really know Paulo, but from a quick glance he seems to be one of the many people who left Christianity to pursue the stuff it expressly demonizes (yet in doing so legitimizes), just to return to it later on without having actually truly left it's framework. Having been raised Catholic furthers my presumption here, but again I have not looked into the man beyond this.
To be fair, I was actually diagnosed with ADHD, alongside dyslexia and several learning disabilities. But I guess you knew that already. (I could guess, but didn't know) As for whether or not I was overtly excited by small changes -- I would say jumping to a D or C student to a having the highest academic scores in the school overnight is not a small, incremental improvement.
Most people with some form of focus problem can end up diagnosable in the ADD spectrum, it's too commonly prescribed for symptoms that can be present within clusters of unrelated problems and Big Pharma does not help that, but rather streamlines the issue into something quicker.
I have also been diagnosed with ADD, but upon further work it was clearly part of something larger. In the field, if one disorders symptoms can be explained as coming from another source (such as depression from bipolar), then they are more likely to diagnose the person with that rather than writing down both. OCD interestingly enough also has much higher odds of piggiebacking hyperactivity problems, you rarely see it hit the more tired ones.
The ADD range though often reports how you did over school, both for why their grades were bad and how they got better. Focus-problems from hyperactivity is very telltale, usually able to do well enough once given a path to hyperfocus on while otherwise struggling to steer where that hyperfocus goes (unless in key hobbies that have locked in).
I would still consider this incremental improvement since the problem wasn't academic any further than being a symptom of the larger issue: Focus. People who don't feel challenged by their environment have a tendency of giving up on it, but that doesn't mean that once that changes that the slacker is suddenly smarter, just motivated, and just as quickly that motivation could tangent elsewhere if not burn out from going too hard.
As for running as a kid, ever since what you call a small incremental improvement, I had the highest score in every race up until university. I'm not necessarily bragging, but I'm just saying that these realizations did not lead to small, incremental improvements that, as you say, I was overtly excited about because I was hyperactive.
Omg the hyperactive spaz was an expert runner too?
I grew up with someone like this, he was ADHD to the point that he couldn't stay in his chair in class. He got in all kinds of trouble for it but the guy was not an idiot, just too jumpy to not be spending his time throwing pencils into the ceiling and stuff. He was effectively cursed with the Bart Simpson problem.
OCD does have ranges, and I'd say that your analogy to "blinking" sounds very apt. I think you don't need to blink, either, if you don't want to. When you do resist blinking, at some point you will feel the biological imperative to blink, but that's no longer a mental imperative. If someone was giving you eye droplets like that scene from clockwork orange, I think you could just not blink. Bug bites, you can also just not scratch them. I get what you're talking about, but I'm saying that you can just choose not to do it.
The part where you lose me is the "just", it's not like you just walk through a door and no longer need to blink, eventually it begins to sting and permanent sight loss can follow.
I bring up the comparison not just over the automatic urge to do it when not thinking about it, but over how it can burn to resist doing so. People with compulsions almost look pinched in some way, and the behavior often works as a circumvention for that sensation even if the behavior has nothing to do with it (like organizing your Sweet Tarts or M&Ms by color). Following this behavior however reinforces it, and in time can become automatic as a triggered response connected to said pinch, lending to people doing weird stuff like yelling out cuss words, pulling out their hair, hitting themselves in the chest, all kinds of things that are not related to the bigger problem.
Have you ever seen how someone becomes suddenly angry for no apparent reason when they visit a place? I like to think that they just accessed a section of their brain that is associated with some shitty memories and experiences. Being hopeless in front of those feelings and mental habits is what I call zombie mode.
Sometimes it can be as simple as having enough cues from unrelated things otherwise connect to the same feeling, a lot of what we go through are associative patterns no better than Pavlov's Dogs.