In reply to Jackspratt
I have had various problems with my shoulders over the years, especially my right one. After doing all the therma band and strengthening exercises, one physio used ultra sound and he found that I had calcification on/in the tendon which rubbed as I moved it up and down - you could see the tendon moving and catching on the screen! I had some shock wave treatment on it and after a week the smaller bits had dissolved.
These calcite deposits can come and go naturally but I was in considerable pain with mine and it got rid of the pain, I have had kidney stones in the past so I must produce rocks quite easily! Apparently Tea, Chocolate and Chili are bad I've been drinking some Chanca Piedra tea and so far so good (stone breaker tea!).
Obvioulsy you may not have this but maybe worth having a look at just in case.