I'm chronically ill and I have ADHD. I can't work right now, but I suspect that if I ever get to work, I will probably do a lot of different things over time. Sounds fun. If I had to do the same thing my whole life, I'd be more depressed.
You might do well being self-employed in some way. That way, you have greater flexibility in changing "fields".
To echo @_Rook_, I think therapy would also be useful here. Maybe even some kind of medication adjustment.