Hey everyone, I'm new to this but I really need some help and I'm sorry if this is in the wrong spot...

About 5 years ago I had really bad sharp pains in my sides. Everytime I went to the hospital, something different was wrong with me. I heard everything from consitpation, the flu, inflamtion that females get... finally one day, it went away. Well I just kind of forgot about it.

Then about 2 weeks ago, the pain came back worse than ever. It started in my left side right where my rib cage ends. I also had some rectal bleeding and was very shaky. I went to the ER and they sent me to get a colonospopy. Well according to the doctors, I'm healthy. I'm sorry but people don't bleed out of their butt for no reason. Now the pain is so bad, it's moved to my left back side and to my right side, where the original pain started. The doctors have no idea what's wrong with me. The bleeding has stopped but I feel very nauseous and am tired all of the time. I can't decide if it hurts more to stand up or sit down but it hurts more after I eat.

Does anyone have any suggestions or anything?
Thanks!!