I have "metacarpel" something or other in my thumbs especially my left and I am right handed!
Bascially arthritis and the cushion wearing out. I have had several injections in both thumbs and it works
great for awhile. By a thumb brace and WEAR IT! I wear mine at work all the time since I am on the keyboard
at my computer all day. The brace keeps my thumb in place and helps me remember NOT to move it the wrong way.
It really does help! you might try one. Good luck! It is so much fun "getting old" ! Yea right!!!!!!!!!!!! ha