OK. Here's the skinny on all the testing that I've been through in the last few weeks:
The clinic seems to think I've been dealing with a very drastic type of IBS. They believe I've had it for years and they have implemented treatment with prescription drugs until late July. At that time I will be re-evaluated to see whether the medication is effective or if I truly am dealing with IBS at all.
So far, the medication is helping a little. I'll have to give it a little more time.