1) Stop drinking alcohol for at least a month.
2) Stop using aspirin, ibuprofen, naproxen and other non-steroidal anti-inflammatory drugs (NSAIDs).
3) Have a stool test for intestinal parasites. There is extensive medical literature on intestinal parasites causing symptoms like fatigue, joint pain and skin disorders, without causing diarrhea.
4) Adopt an anti-inflammatory dietary pattern. The principles are simple to understand: avoid foods with added sugar and refined starches, made from white flour. Decrease consumption of saturated fat and most vegetable oils, using extra-virgin olive oil instead. Eat at least 9 servings of fruits and vegetables a day and at least 4 servings of fish per week.
5) There are dietary supplements that help the small intestine heal and restore its functional integrity. The most important of these are the amino acid L-glutamine and the amino sugar N-acetyl-glucosamine, which are readily available in health food stores.
These are but a few introductory steps toward an integrated approach to this condition.