To keep the GI tract mucosa healthy, one has to have Omega-3's in the diet.

Also I'd suggest Kefir...as this has 12 strains of probiotics in it.
(more than any other food source).

Excessive motility, and flushing can be a serotonin reaction.
This can come from tumors around the GI tract called carcinoids.
This is not common, but is overlooked in difficult to diagnose patients.

http://www.carcinoid.com/patient/und...62109045829652

Not everyone gets all the symptoms, but as the tumors spread past the liver, the symptoms increase.(serotonin escapes into the general circulation then).

This is why some people on SSRI antidepressants get diarrhea and flushing too...it is a serotonergic response.

I'd also suggest some high dose biotin..this helps alot with skin and mucosal linings. 5mg a day for a while may show you some improvements. This is inexpensive and not a toxic type supplement and often overlooked by doctors. Difficult GI problems often respond to biotin, even chronic canker sores in the mouth. I get mine at Puritan's, and now Costco has started selling Natrol brand.