Ways to prevent or relieve finger stress?

I'm on a stick (TE). Sometimes I get a pain in my pointer finger. Not sure what causes it exactly, because some times I get it, and some times I don't, but I'm guessing it is probably from over using the finger. (Although why it happens some times, and not others, is a mystery to me, because I play for hours and hours. And the pain just started this year, and I have been playing on a stick for a long, long time.)

Anyway, posting this in Tech Talk hoping to hear about some sort of hack or related idea to prevent the issue. Open to non-tech responses though or any ways people with similar experiences have dealt with it.