@berber19
From Cleveland Clinic:
"Focal dystonia is a neurological disorder. It causes involuntary muscle contractions in one body part. You may have muscle twitches in your neck, face, jaw, feet or hands. Focal dystonia that affects hands and wrists"
https://my.clevelandclinic.org/health/diseases/22796-focal-dystonia
After several years of having "mystery symptoms", I realized I had dystonia. Dystonia has to do with the "circuit board" in our brain, the basal ganglia, going "haywire". I call dystonia the "snow flake condition" because no two people with it have the same exact symptoms.

I do have sharp pain in the joints that come and go. I wear wrist braces and a neck brace each night to avoid severe numbness. When I highly use my dominant hand, my non-dominant hand will have severe cramps.

"Attempting a movement task on one side of the body may activate dystonia symptoms on the opposite side."
https://dystonia-foundation.org/
Caffeine and alcohol aggravate dystonia. (I gave up both and the symptoms decreased.) There is no medical test for dystonia. There is no treatment specific for dystonia, although doctors will try drugs, usually seizure drugs.

Check out: dystonia-foundation.org