I've been having sharp pains too, just on my right side in the back, thought it was my kidneys, because I get kidney stones, but I found out I also have a cyst in my right ovary. My doctor is keeping a close eye on both, but is unsure which is causing the pain. Maybe have them do a pee test to check your kidneys. Good luck. Hope you get it figured out!
Is it when you eat? It could be insigestion. I know it sounds silly but I'm serious
You should call and ask. Is it like a cramp?