I wish I could help but I am in much the same situation as you. About 12 months ago had numbness in my shoulder when riding or just looking upwards, went to my doctor and got a CT scan and he said my only option was surgery. I didn't think neck surgery at my age(42) was a good idea so went to a physiotherapist to get his opinion. He said that I didn't need surgery and proceeded to try and loosen my neck and upper traps with massage and dry needling. After two months the numbness had gone away but I was left with a slight burning sensation along my upper trap into my shoulder. The pain seemed to me be nerve related but he assured me it was entirely muscular so I continued with his treatment. After another six months of fluctuating symptoms and no improvement I decided to see a different physio.

The new physio immediately said my problem was a neural impingement and gave me exercises to increase thoracic mobility and improve posture. After some initial improvement symptoms worsened and she referred me to a sports doctor. The sports doctor looked at the CT scan and said there is nothing structurally wrong with my neck! Although I was relieved to hear this it didn't really help me with the problems i was experiencing. So I'm working with the new physio now and treating this as a muscular problem again. I really hope it improves soon as I've been off the bike for 12 months now and lost a lot of strength/fitness.

I'm sorry I can't be of much help but just thought I would relay my experiences. Get well soon.