ADHD, OCD and ASD, medically diagnosed.
ADHD is like having a constant torrent of thoughts flooding through my mind. My inner voice is never quite, never resting always talking. I sometimes feel like I can talk for days (though it may be nothing you want to hear about) others I feel like I just need to crash. I'm bursting with ideas but I lack the drive to finish many of them as I just can't concentrate on anything. It irritates me when people say that I'm just misbehaving or being loud and that I should just stop. Please, if you find a way to turn off your brain that isn't drugs, sleeping or death, tell me!
OCD is a constant stream of thought as well but it differs in that I'm obsessing over one or two things instead of a multitude of small little things. I can have a perfectly nice night out drinking with mates and in the morning I'll be analyising everything I can remember too see how I embarressed myself, even if I didn't. Intrusive, unwelcome thoughts are also much more frequent than I would like. They make many things a chore because I find it very hard to differentiate between what me real thoughts are (as in what my personality would generally output as an anwser) and what is just an intrusive thought. When people say "oh I've got to have all my pencils in just the right order", that irritates me. They have no idea what it's really like to have OCD.
ASD means autistic spectrum disorder. I have difficulty in social situations, knowing what is the difference between normal speech and sarcasm, if I'm annoying people or not etc. The list goes on. Luckily I'm high-functioning. This means that I can hold up a fairly normal life I just have to play life on hard-mode for the first few years as I learn social skills that others take for granted. It irritates me when people say "retarded" as if I had been born 50 years ago or more I probably would have been labled that.