I don't believe in IBS with Crohn's. If the intestines are inflammed, of course they are irritable. To me, it's a simple matter of logic. I believe that IBS is a diagnosis GIs throw at us when they just can't figure out why we are having symptoms.
I am in the same boat as you, only my scope showed NO INFLAMMATION. I am having terrible cramping after I eat and periodic episodes of diarrhea. My GI says I had Crohn's sometime recently, as I have new scarring in my colon, but since he didn't find inflammation now, I do not have Crohn's. UUUGGGHHH!!! He says he just can't see any reason that I should be having the syptoms that I have.
I have narcotics to help with the pain from my joints and my gut and I also have a script for Pamine Forte (Methscopalamine) which is an anti-spasmotic. I really don't know how I'd get by without the 2 of them.
I just read your current meds. Why are you taking Reglan? It's purpose is to help with slow bowel and it speeds food through the GI tract. Could that be what's causing all the D? It's certainly a possibility. I first tried that to help with heartburn. We figured it would help move the food out of my stomach, but it caused horrible D and so I only used it when I had constipation.
I hope you find some relief soon.