You think it's gone, my friend, but it comes back again

I have sprained my thumb. At least, I have no other explanation for a restricted range of movement, a considerable amount of pain, and twinges and aches that run down into the heel of my hand whenever I try to grasp something, with the result that I cannot perform a lot of normal daily tasks with my right hand, don't even ask about texting. I don't know what caused it. For about a week I thought it was getting better, and as of yesterday it definitely is not. We just made dinner and now half my hand is on strike. Typing is considerably slower than it should be. This is especially aggravating because I saw two movies yesterday that I want to write about. Unrelatedly, I would like to sleep at night again, sometime, ever.