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Some folks talk about "Copper" products which can help "reduce inflation" or some nu-age crap but what actually helps is compression. Basically it works the same as when you rub your joints and it relieves the pain briefly.. only it's an even pressure.
I'm not sure if you have tried these but a pair of compression gloves might help - plus they're finger-less so you don't lose your typing/clicking abilities.
These help my mother when she has her Arthritis when typing.. again I do not know if you have tried this or not.
Hero picks I'd actually say try out Moria as well - aiming is a lot more forgiving on her, as the "lock on" for her main damage is very good as is the "spray" for her main heal. Also the orbs, while important, half the time can be tossed at a wall or anywhere in a room where your team is and heal them up pretty well.