I can totally identify with that...A couple of years I was diagnosed with an eroded vertebrae in the c5-c6 section of my neck that exposed a bundle of nerves related to my right arm and shoulder.
The pain can be mild to quite excruciating depending on how eroded the vertebrae is and how much the nerve is being pinched, In my case, the whole nerve bundle was being crushed between vertebraes and there was a crack in that vertebrae wall. I would get sharp and shooting pains that went from my neck all the way down my shoulder and down my arm and through my right thumb and forefinger. The sensation is like if you put your arm on an electrified fence and held it there.
If the pain gets exceedingly worse, it would be time to go see a neurologist or someone who specializes in spinal injuries or surgery.
Oh Wow that is the reason today I'm going to see my doctor he gave me a cortisone shot 2 weeks ago..But now its come back.