Hi. For The Past Three Or Four Days, I've Been

Hi. For the past three or four days, I've been noticing a pain near where the bone of my thumb arches to connect with other bones. It hurts when I touch it, and when I move my hand in any other position besides a neutral position, hurts a bunch. The right side of my wrist is hurting as well, but the pain isn't noticeable when touched. I've been trying to work through the pain, and if I keep my wrist in a neutral position, the pain is barely noticeable (besides aches.) Also, my wrist is constantly falling asleep and is weak in general. I have been playing the piano since I was two, and usually I can get through ten pages of music in a row without my hand getting tired. Now, my hand/wrist gets tired after a few measures. What's wrong?