This is the thing I've found on-line that even remotely comes close to describing what I've been experiencing! I am 27 years old. VERY healthy and strong, never smoked, drank or done drugs of any kind.
Every morning for the past few weeks I've been waking up with aching and sporadic shooting pain deep under my left rib-cage, going all the way up to my collar bone. When I roll to my left side it gets worse. On my right side the pain usually abates. I hadn't been feeling this pain during the day untill lately. For the past 3 days it's been more constant with more severe shooting pains that seem to coincide with my heart beat.
Let me know what you find out!

I think I might know what you are dealing with and I have been to the doctors several times over this and its something that they call plurisy. It is inflammation in they ususally give you ibuprofen or something for inflammation to help with it because it usually goes away on its own, if its not that it sounds a lot like indigestion.