Three gastroenterologists have assured me that my abd. Discomfort is functional. Even after CT abd. & chest, colonoscopy, celiac panel, I am anxious.?

"I am anxious" If you've had multiple GI consultations arriving at the same conclusion, then it's time to pursue treatment for your anxiety. Many people with anxiety disorders worry extensively about their physical health. The GI system is richly interconnected with brain and emotions. Treatment for the anxiety issues through appropriate psychotherapy and medications if needed, can provide relief.
Functional likely. 3 GI doctors seems like a thorough evaluation. Functional pain and anxiety go together.