[MRM]

If it's from sanding and such it's a repetitive stress injury. It's not going to heal with therabands and their ilk. You really need to go into a sports medicine doc who can straighten you out. More activity might aggravate it. In my best I play a doctor on TV and stayed last night in a Holiday Inn voice, I'd suggest that rest, ice, stretching and gentle activity are probably the ticket home. There's obviously inflammation going on in there. You didn't get where you are in a day and you're not going to heal in a day. Get thyself to a doctor and get some real treatment. You could end up with a permanent injury if you try to treat it yourself, especially if you try to exercise your way out of it and end up doing more harm than good.

The good news is, as Tobra was suggesting, if you don't have tingling and numbness and radiating pain and the fingers all work right, there probably isn't an orthopedic or true neurological injury. It's probably a painful muscular ligamentous injury that will heal if given the proper treatment. But it will become a permanent neurological injury if you keep abusing the muscle.

It's cheap insurance. See a doc.