I have Behcet’s Disease. Fortunately I have a moderate form of BD, others are not so lucky.
Changing my diet has improved my fatigue and although has not cured the BD has at least eased some of the symptoms.
Information about the diet and health related matters at Dr. Myhill’s very informative website.
If you’re ever struggling to explain what it feels like to have a chronic illness The Spoon Theory by Christine Miserandino articulates it brilliantly.