I feel fairly certain that this pain is connected to your IBS ... in fact, it can be found in many of the 'symptoms' lists on various websites. It is not unusual for you to have sharp pains throughout your entire intestinal area (fortunately or unfortunately!! :-) ...
Sometimes these sharp pains are caused by trapped gas. I knew of a lady who was actually hospitalized for HEART PROBLEMS when it turned out that all it was was trapped gas! ...
I think we all have a tendency to 'think the worst' when we develope a 'new pain' ... but IBS can be tricky. I have found that when I have a particular 'new pain' that doing a lot of walking will usually alleviate it fairly soon.