Did they check for any damage to your neck? I'm just wondering if it could be caused by that type of damage. Also, CT scans don't really show anything except if you have a brain bleed. My husband doctor doesn't recommend one for him at all since he never had any symptoms of bleeding on the brain. If his issues go on he will get a spect scan or a functional MRI. I might see a chiropractor if I were you. Damage in the back and neck can affect the gut.