Sorry to hear about the fall and of your thumb freezing up, Fin!

Please take it easy and don't overdo it too much even though it's hard at times!!!
I understand the thumb freezing thing. I have Dystonia (a movement disorder) in my left leg and right arm and it causes my muscles to freeze into position. My leg is rotated out to the side and my arm was in a fist for over 3 months. Sorry you had to deal with that also as I know how painful it is!
Good Luck with your doctors appointment on Thursday! You are in my thoughts and please keep us posted when you can!