Heather

If not too personal, what part of your abdomen is the pain in? Upper/lower?  Center, left-side, right-side?

I have dealt with these issues for years...several things have been implicated in my lower abdominal pain...1)IC (lower center and even a bit to the left or right sometimes), 2) spasming colon (lower left, mid right, upper right).  I also had some associated with cycles but went on a very low dose continous bcp so I didnt get bedridden for half the month.

If you haven't had a colonoscopy (yayyy!), you might consider that.  Also, you might get the IC testing.  IC can be pain only, mine is...also for some people the inflammation can be in the top part of the bladder so pain can be higher.  As they have ruled out girl probs, those are two other ideas.  If you haven't tried them, antispasmodics, such as bentyl or levsin can be really helpful in a crunch.  If they help, is either colon or bladder.  They are one of my  "backup" meds if things really start heading south (oops did I just say that?).

PS-I have pretty severe environmental allergies and a couple of drug allergies.  I do have IBS/GERD and IC. A point of note, about 75% of IC patients have diagnosed allergies, while maybe a quarter of the general population does.  So, there seems to be strong correlation there.

My IBS symptoms are controlled with prilosec and zantac and I think the lyrica helps too.  Before these meds well lets just say that 5-10 times a day was not unusual + it was ridiculous working with that.  

When you are trying that elmination diet you might also give a peek at the IC diet they are pretty similar if you start out with the basic diet + drink only bottled water (that can be kinda tough).