For the last few weeks, I've been getting a sharp pain in my lower right side. It is at its worst when I have a full bladder, particularly when I move after sitting down for a while or sit down suddenly. Sometimes its so bad I can't really walk without bending over to the right to ease the pain. It also seems worse when I have my period. I have IBS but I don't think its related as its been going on so long, my IBS pain moves around and never stays in one particular place for long. Does anybody have any ideas on what it might be?