Hello Matt. This past summer, I experienced pretty much the same symptoms you are experiencing now, except both hands (the left was far worse, though). I figured that since I do a lot of typing at work, I had probably irritated some nerves or something. I went to the doctor, and he diagnosed me with carpal tunnel. I wore a brace for a couple of days, but that seemed to make it even worse. I ended up going to another doctor for a second opinion, and she said I had De Quervain's Tenosynovitis. She prescribed an oral steroid and Mobic for the pain. I got a different brace for De Quervain's, which felt a lot better than the carpal tunnel brace, but immediately after taking it off, the pain, numbness, tingling, and swelling would come back. I was freaking out, having panic attacks, and went to the ER. They told me it just looked like plain old tendonitis and put me on 800 mg Motrin. Even the Motrin didn't seem to help. Finally, I couldn't take the anxiety anymore and went to my pdoc who very lovingly told me I was experiencing health anxiety and that my symptoms were being amplified due to stress, and put me on Zoloft. I thought he was crazy, but lo and behold, a few weeks after being on Zoloft, I realized I hadn't even thought about my hands. The symptoms were gone.
It all makes sense to me now, especially since none of those high dosage pain meds helped, which is odd because they usually help me with even the most severe headaches, muscle cramps, etc. I probably just irritated a nerve or tendon, and instead of brushing it off, I fixated on it, making the issue seem far worse. The pain was mostly in my head, it seems. It's amazing how our minds can trick us into thinking we are a lot worse off than we are. This is easier said than done, but try your hardest not to stress over the numbness, tingling, etc. It will pass with time. And, if you are anything like me, you have probably manipulated your arm in ways that you normally don't, just to test out all your symptoms