I get terrible pain that I just can't get rid of, seems to come from right underneath my right shoulder - its only ever the right and in exactly the same place each time! It only seems to come on when I'm on my period or when my endo is just playing up. Is it a normal symptom? I can't seem to find anything about it online and not sure if its an endo thing or perhaps a muscle thing, maybe I hold myself strangely when I'm pain??? Just strange its always in exactly the same small spot!