Hi, Thank you very much for your questions; although it is quite difficult for me to give you a precise opinion here without being able to examine you, but I would try to provide you some relevant information about your shoulder pain. Your symptoms could be suggestive of either some nerve injury or a pressure on the nerve due to the muscle spasms. Another possibility in your case could be damaged the soft-tissues such as muscles and ligaments if you are over-doing any shoulder exercises or lifting heavy weights. Since you have persistent pain, I would recommend you to see a neurologist who can evaluate the details of your case and could better determine the insight of your situation. In addition, it will be best if you would also visit a physiotherapist to let him/her assess your back and shoulders. Hope this helps.
could be rotator cuff for sure. I am a PT and this is pretty prominent for rotator cuff pathology. See a PT..they will be able to do a more thorough exam.
Sounds like it could be Frozen Shoulder.
I have the same issues with my shoulders as you have been having guido7. I have yet to have a diagnosis, I have been seeing a neurologist. I have other issues as well along with shoulder pain, burning and weakness. So far my neuro has diagnosed me with small fiber neuropathy, haven't had chance to ask her if it affects my shoulders but from my research I believe not. I wish you luck in finding answers and if you do please pass them along to me and I will do the same for you.