I doubt what you have is ibs, the problem you're having seems to be gastrointestinal.

Thankyou, I must check those sites out, im not sure what my problem is but im going to find out

Ibs should be diagnosed with visual and biopsy methods, not just symptomologic reports...And it usually includes either bouts of constipation or diarrhea, which you did not mention

you appear to have overactive peristalsis...If I were you i'd simply try a 1/6th dose of loperamide (sold over the counter) and see if it calmed things down, especially when you were about to face quietude and stress! It's got anticholinergic activities and will slow this autonomic activity in the gastrointestinal tract...
One of my medical finals was four hours long, I hadn't eaten nor slept, and my stomach and intestines were like an orchestra! Eeyoweewoyowawawa and people were laughing, but oh well...Of all people they understood best