There was a study from 2001 that found in those people who suffered from both CFS and IBS, there was a noticeable lowering of brain blood circulation in that portion of the brain that controlled digestion. The ME Society in the UK also found a similar perfusion problem in the brain stem of CFS sufferers. Were it not for the fluctuation in blood pressure, this might be the easiest link to explore. (As an example, the gingko and grapeseed in the supplement I use for my cardio-IBS issues will increase circulation and can cross the blood brain barrier, making it useful for a number of brain-based problems.) In the Wiki page on Vasovegal episodes there is the following quote from Durand, VM, and DH Barlow. 2006. Essentials of Abnormal Psychology 4th Edition. pp. 150: "The cornerstone of treatment is avoidance of triggers known to cause syncope in that person. However, new development in psychological research has shown that patients show great reductions in vasovagal syncope through exposure-based exercises with therapists."I have no real exposure to psychotherapy techniques, but that certainly sounds similar to Cognitive Behavior Therapy, which has been found very helpful for IBS issues. I don't know if it would have any effect on CFS or ME issues; but it might be worth exploring.My best to you in finding something that will help you.Mark