Sound like you need to be check out for Carpal Tunnel Syndrome... As soon as I read your reply I immediately talk to my wife. She had Carpal Tunnel Syndrome years ago. Also she said that the pain seem to have started in her thumb.
You may want to curtail any exercise until you have it checked by a Dr...
What you do for work could also contribute to the problem..
Good luck getting rid of the problem. Wife said after repair and therapy her wrist work great