Had a 3 day migraine when i was 15. I could only lay on my back, in the dark with my eyes closed, except when i had to puke, which was often. I've broken a lot of bones, been stabbed, shot, etc. Nothing even comes close. I'd rather die than go through that again.
Though...I am of the firm belief that the first microsecond after you bite your tongue is the worst pain imaginable. That shit hurts. lol