I thought I'd gotten over the hand/wrist pain!

Trigger Fingers/thumb are so weird, aren't they @Afraser? Some can be quite painful, as you have to physically straighten the finger with the other hand when it locks ....

I'm glad yours stopped as suddenly as it started.

Gosh, you've had a lucky run with Letrozole!!  I reckon you should be on some sort of study, to see why YOU don't have any/many side effects, vs so many of us that get shockers!  ;)