bcipam - if the colonoscopy doesn't find anything, then you will probably be stuck with the same diagnosis as the rest of us - IBS (Intestinal Bull Sh--)
It's gotten me really depressed before, b/c my clothes don't feel right, or I feel way too "gassy" to go out in public, and I certainly can rule out any intimacy with my SO. Of course the catch-22 of that, is that the more it's on my mind, the worse I feel. Isn't there some theory that your body goes through allergy/tollerance cycles every so many years? Maybe the foods you used to eat, just won't work anymore.
My IBS started when I was 14, though I didn't know it had a name. I just felt terrible after lunch when I was at school. Like my colon was being pumped with air. My clothes would hurt, and I was always terrified of having an "oops, that one just slipped out" moment, and having "Fart girl" written in the high school yearbook
'sigh'....memories. Wasn't high school great?
Regardless - I have wondered about Zelnorm, b/c laxatives and such don't work for me. It's like everything just gets stirred up more, but still won't leave.