Many here have experienced the diagnosis roller coaster, myself included. I presented with Crohn's symptoms numerous times yearly for over 15 years. i finally stopped even telling the doctors and just suffered through the flares. After 10 years of trying to ignore "the beast" I had a severe flare that I could not ignore. I was finally diagnosed after 25 years.
Have they done a capsule endoscopy? This is the camera pill that photographs the small bowel. Most of the small bowel cannot be seen with either an upper endoscopy or colonoscopy. Crohn's can be confined to the small bowel making it tough to get a diagnosis. Also, we have quite a few Crohn's members who present with constipation rather than diarrhea. Your doctors are a bit behind in their understanding of Crohn's if they think constipation cannot be a symptom of Crohn's.
BTW, welcome to Healing Well!
Moderator Crohn's Disease Forum
CD, Ankylosing Spondylitis, lupus, small fiber peripheral neuropathy, avascular necrosis, peripheral artery disease, degenerative disc disease, and a host of other medical problems.