What you asked me would take much longer to answer, and your reasons for wanting to know are disingenuous. At least answering mine will grant a little more of a motive to see how I ought to answer it or if it's even worth answering. Seriously, you even went with "Is it something that is triggering it?". 
So, why are you here?
if someone here called me fat it wouldn't bother me in the slightest because it's just a meaningless, random insult when I've neither said nor done nor shared anything to indicate I could be overweight.
You, on the other hand, have posted pictures showing you could stand to lose a few pounds/stone. It's not just childish, random insults when it's got actual basis in reality and you've posted evidence of it yourself, no less. We're just concerned about your health, Judy...
Edit: and Mika, I was 100% serious (if perhaps having a little fun) when saying my ex had this problem. He used to hear the sound of 'a little man screaming' in his head when tired, and he was a textbook case of BPD. I'm not saying it's necessarily related, but if this is a genuine problem you're concerned about then go see a professional.
"if someone here called me fat it wouldn't bother me in the slightest because it's just a meaningless, random insult when I've neither said nor done nor shared anything to indicate I could be overweight.
You're virtually a non-entity here, so I doubt hardly anyone would even notice if you did.
You, on the other hand, have posted pictures showing you could stand to lose a few pounds/stone. It's not just childish, random insults when it's got actual basis in reality and you've posted evidence of it yourself, no less."
There is only one picture that people are basing the insult on. It's over 10 years old and I don't even look fat in it...
This whole thing is not over one person calling me fat, this is a cycle of daily harassment that has been ongoing for years.
My weight, regardless of what you believe it is, shouldn't mean an ounce of shit to any of you, certainly not enough to warrant daily insults that I've heard from the same people a hundred times before.
It's tedious. You're like a bunch of mosquitoes that don't know when to give up.
What exactly is the big deal if you hear voices in your head? Everyone does! Where does the perception of sound or thought or other senses go? Your brain. (I typoed "You're brain" which might have a certain relevance.) Encoded in quantum biological microtubulins in the neurons. (The last bit wasn't exactly serious.) All experience is merely a correlate between brain and environment, wherein the mystery of measurement collapsing the waveform turns into real all possibilities there and then.