I have no idea if this is going to be in any way helpful, but I always had trouble handling work too, and quit every job shortly after starting. Now you said retail is out of the question, and if I understood right it's because of carpal tunnel and something else? I was wondering if Toys'R'Us would work for you. I started there three weeks ago, and not only is it incredibly fun, the work environment is awesome (I don't even know where to start on that one), and it's really easy, basically you just help customers find what they're looking for (so you just need to memorize the layout of the store), or help them decide on what toy to buy. Really the only pysical work is occasionally (during downtimes) pushing a cart around and taking misplaced items from the shelves and putting them back where they belong. True, it only pays a tad over minimum wage the first year, but if you do well you get a raise every year, plus they offer benefits even for part time employees. And nobody there treats you bad. Not the rest of the team, not the customers. It's a very happy place. I worked last night (Black Friday), and every single person I dealt with was friendly andthankful for my help.

Okay, that was long. Like I said, I don't know if that was even helpful.

I had two other great jobs before that. One was housekeeper at the Army Hospital. Two hours a day. Cleaning my designated clinic after everyone went home. No stress, no contact with anyone.
And the other one was working for a petcare company. I mainly walked dogs, but I also pet/housesat. That was a lot of fun too (except for rainy days in the winter).