I've got an awful work history too. Spells of unemployment and so many jobs I've walked out of, I've lost count. Also the odd meltdown with sudden loud verbal outbursts (I'm usually very quiet).

I've been in the same job now for the last 2 years (I'm 39) and this is after spending some spells thinking I'd never stay in a job that long ever again. I've had a couple of times when I almost lost control but managed to get out and leave the situation in time.

Have you tried the public sector (local government etc) they tend to be more compassionate about health issues of all sorts and the culture can be better than the profit driven private sector (although it all depends on the people). Depends what sort of work you usually do though, I tend to work office jobs and don't have any experience of anything else. I think if I ever leave my current job though I'm going to try a non office environment but as office jobs go, it isn't too bad.