I Have Been Experiencing Pain Under My Upper Rib Cage

I have been experiencing pain under my upper rib cage for about 2 weeks, especially when trying to get out of bed in the morning. I sleep on my left side primarily, but am able to lay on my right side. However, when I try to roll over on my right side to get up I experience a lot of pain. Once up, I can function ok. I even play golf with no problem. I do have a chronic back condition which causes me a lot of pain on a daily basis.