nessie0159, I see chiropractors and they adjust my thumbs and my wrists. It seems a little crazy, but it provides immediate relief for me. If you did decide to go you might let them adjust everything because I always feel better even in places that weren't even a problem. You might call the doctor and ask them to order an x-ray of your hands. Is it both thumbs. My dad was having that unable to grip pain with his thumbs. After he saw the chiropractor, he never had the pain again. I can use mine but they get a little uncomfortable sometimes. I like chiropractors because usually you can see them same day.
If it's both thumbs you might ask for a serum draw for rheumatoid factor.
Tylenol, for heavens sake
If you end up at urgent care, you might ask straight up for the x-ray and the blood draw.
Have you been doing a lot of work with your hands.
Some people have gout in their thumbs; the joints get offset in mine and I can't do any gripping or pulling and nothing requiring that opposing thumb, my sister has rheumatoid arthritis first evident in her thumbs.
There is really almost nothing that you can do without those thumbs.