I don't know why my physio didn't suggest it to me earlier but I have stumbled upon jigsaw puzzles for therapy. The repetitive movements of sorting pieces has done my lymphedema arm the world of good....
My biggest was a Ravensberger 5000 and a Clementoni 6000, both old master paintings. My kids challenged me with the sizes! Did them both but never again! Did you know that Microsoft Games has great puzzles free - only 200 pieces but enough to take your mind off things.
I have 1/2 dozen 500-1000 happy to give away if anyone is near the Gold Coast - too bulky to mail.