I have a horrible pain on my right side. its right on the side of my back just above my hip. I have a slight corresponding pain on my left side but its more of a niggle than a pain. What could it be?? I've been drinking heaps of water incase its my kidneys but that doesn't seem to be helping. The only other think I can think of is AF might be causing it but I've never had anything like this with AF before.