Shoulder Pain

Lately, well over the past month and a half, I've been experiencing extreme should pain at night. The pain is so extreme that it wakes me up several times during the night. Usually, I sleep on my side, because that is the only position with which I can get comfortable. The problem comes when the pain hits me, then I have to switch side and the cycle repeats all night.

I've tried some methods to try to alleviate the pain, including extra pillows, etc. , but nothing works.

I have shoulder pain during the day, but I think that the sleeping exacerbates the issue.