Hi Bobby78,

my symptoms are quite similar to yours: shoulder/neck/arm/wrist pain, on and off weakness and loss of dexterity, finger numbness which gets worse with shoulder stretching etc.
Like you, I have no diagnosis and all tests came back negative.
I have seen more doctors than ever in my life, but none of them sees anything wrong. They all claim there is no loss of strength, even when I can barely hold a toothbrush.
Had to give up running, riding bicycle, exercising, driving (except for appointments), reading and many other things.

I think you found the right forum.

Things I tried which did not help: medications, acupuncture, trigger point massage and active release, trigger point injections, strengthening and posture exercises, aggressive stretching.
Things which are helping: gentle stretching, relaxation, breathing exercises. Staying away from computer and avoiding stress helps a lot too.