Well, as you've stated, you have to force yourself to do things and had to find a specific role for yourself in order to find something that worked for you. It's "fine" now, but anything outside of this lifestyle sees you struggling as you admit to in some way. And that's in no way a judgment--it's just not as simple as you address it to be. Chemical/neurological imbalances can't always be solved by simple lifestyle changes, and in the opposite direction, aren't the reason those imbalances occur.
But I get what you're saying with the convenience store. Finding something for yourself full of tasks allows you create a full day of checklist items and you never get to stop and worry about it. I miss working at the deli I used to work at in college for the same reason.