Hi HockeyGuy,
What you wrote is eerily similar to my situation. Whenever I am nervous, I have had the same problem and it is embarrassing. For me the nervousness leads to gas and, perhaps, even more of a problem for me is that this gas usually gets trapped in my colon not my abdomen. Hence, the only way to relieve it is going to the bathroom.
I can fully sympathize with as I have also taken the actual LSAT. Combining with the psychological effect of this situation, taking a 4 hour something test is a nightmare, nothing short of a trauma. The problem, however, is that in law school this reoccurs every time you have finals. I'm not even gonna mention the 8-hour bar exam.
Unfortunately, I have no answer to this problem, and I have been in search of one since I was 7 or 8 years old and then, more so, when I was diagnosed with IBS.
From what I gather, no one knows what causes IBS but, basically, our brains have a short circuit to our bowels (i.e. nervousness leads to gas and bloating). Interestingly enough, my IBS symptoms have evolved and changed throughout the years. Although, the symptoms manifested themselves differently, I still have the same short circuit problem.
If only someone would do research on this problem...because I am sure that you and I are definitely not alone (it's a sensitive subject that many are not willing to discuss). I would be so willing to donate to funding of such research!!!
I have found that to a limited extent GasX can help and also anxiety/depression drugs like Xanax can help. However, I am not a doctor and this is just my personal experience.
I read somewhere that IBS can be caused by a single traumatic event. This may be. But, unfortunately, this is a vicious circle that never ends and your fear only makes it worse. Unfortunate it is that one's fears cannot be controlled.
I wish you the best of luck and I hope that, one day, someone will have an answer to this chronic problem that we and so many share.
Regards,
Frank