> I struggled with RSI for a couple of years until I read John Sarno's "The Mind-Body Connection" on the recommendation of someone from HN. Sarno's thesis is that many chronic pain conditions (those without a clear physical mechanism, such as RSI or chronic back pain) are psychosomatic.

I've had two RSI episodes in my life. The first one was similar to what you described and went away without any physical intervention, after I read something similar. The second (specifically, I had carpel tunnel syndrome symptoms) was more recently and didn't go away until I tried these: https://www.mijncarpaletunnel.nl/en/home They say to use them for 6 weeks. For about 4 weeks I didn't notice any change, but by the end of week 5 I was pain-free. They claim that you should remain pain-free for a couple of years after, which wasn't the case for me, I get some symptoms every so often (rarely pain, usually tingling fingers), but between using a Kinesis Advantage2 keyboard with foot pedals and taking regular breaks, its been manageable so far and hasn't caused any problems.