Oops, wasn't quite done. I also wanted to let you know that the fact you're having pain on both sides, instead of one side of your body, might actually be a GOOD sign (even though it sure must not feel like it to you). Unilateral (one-sided) pain is generally more worrisome because it could signify a diseased organ or a blocked area of the intestine, etc. Sometimes bilateral pain can indicate disease activity as well, but I don't think that is as likely a scenario. Also the fact that you've had some imaging tests done and they are clear - that should be comforting.
Granted, none of this helps the fact that you're in pain. I seriously understand where you're coming from; it sucks when no one can give you an answer to that kind of pain (I've been there too). Can you describe the pain? Is it burning, crampy, sharp, dagger-like, constant or intermittent, and where is it located exactly? On a scale of 1-10, 10 being the worst pain you've ever felt in your life, how would you rate it?