I have arthritis of the wrists that is probably a lot milder than yours, and very bad arthritis in my previously broken ankle. Relaxing is important. Pauses help, especially if you move in other ways. The parafin 'bath' helps a lot in relieving pain. I have also found that small changes in the angle at which I hold my hands make a big difference to my wrists.
If you live in one of the states where medical marijuana is legal, a pot + olive oil rub helps quite a bit too. (My doc recommended it.)