Hmmm... re: nerve pain...
The subject is so deep that it takes a lot of questions to determine just what that means. Having gone through a journey into this over the past three years, I don't believe there is any easy answer, without getting into the fine points of what kind of pain, and where. Arthritis is usually in the joints, like sandpaper grinding away. Tendon pain is different, and more to the commonly named "nerve" pain.
The tendons are surrounded by tiny nerves, which become inflamed. Carpal Tunnel is the most common complaint, where the nerves in the hand go through a small "tunnel". This can often be eliminated or improved by cutting the blockage. I was diagnosed with this, and went through the operation $12K. Despite having the pre=operative tests for diagnosis, it was wrong. The operation left no improvement. After consulting with a neuropathic doctor, I questioned whether additional visits and tests... many$$$ would be beneficial, and found no guarantees. Further reading on this reinforced my thinkiing... My actual problem is Peripheral Polyneuropathy... essentially a loss of feeling in the hand... fingers. A continuous feeling of wearing a glove, and pins and needles.
In the beginning there was much pain, especially at night, leading to many sleepless nights and a degree of misery. Neurontin "brand" is gabapenten... generic" helped but not much.... Eventually, the pain either went away, or lessened, or i got used to the problem, and now have no problem dealing with it.. at all.
Much is written on this subject. I spent many, many hours on different websites, just to find that diagnosis and treatment of actual "nerve" damage is not simple or well understood. The combination of Arthritis and nerve problems... extremely complex.
There are a number of UTube videos covering exercise therapy, specifically for hand and arm nerve problems.