Mine started with the same experience. I had shoulder impingement that was misdiagnosed and was told it could easily be fixed with a subacromial decompression. It did not help. I tried to remain active as a tennis player but then my labrum tore and my rhomboids and lower trap detached from the scapula. I had all of that repaired but still had pain and numbness in the entire shoulder and scapular area. Neck pain soon followed and I was again misdiagnosed as herniated disc being root cause. Cervical fusion had no impact on removing the pain. Years later I was finally diagnosed TOS and had the rib & scalene removal. I finally experienced a few months of great relief only to have different pains in the same areas return.

IMO TOS is complicated but the sooner it is diagnosed the better chance you have to get better.