Mine is more where my neck and cranium meet
Feels like they are disconnected some timed

Yes.. same here. I found out that my potassium level was really low..

Yes it happens to me too. I have had problems with lifting my are over my head for years.

I have the same on my left collar bone and left arm hurts when I rotate my shoulder it pops and cracks if I put my arms above my head they go numb after about 5 mins and left shoulder and neck hurts

Yes I have not been able to put my arms over my head. I need help changing a light bulb