In the short term I'd recommend doing relaxed dynamic stretching on your wrist and fingers every few hours, massage your forearms by hand or with a roam roller,

In the short term I'd recommend doing relaxed dynamic stretching on your wrist and fingers every few hours, massage your forearms by hand or with a roam roller, and consider wearing wrist bands if that's where some of your pain is. It's also helpful to readjust the height you sit at, or try standing. When you do start typing again, buy a timer or get a digital one and take regular breaks. I've had this problem too after spending a lot of time on the computer, even to the point of buying a pair of wrist braces that I wore at night. Some kind of compression with a brace, band, or tape is usually helpful for injuries involving smaller muscles, ligaments and tendons. More importantly though, I'd recommend not getting to the point I was at. I read about many people who injured themselves far worse, requiring surgery and major lifestyle and work-related changes. The complete answer is much more holistic, but sleep and rest will help you the most.