The Doctor thought it was Sleep Apnea, but we have been waiting for more than 6 months for the referral to the sleep clinic. Now they think it might be Autonomic Neuropathy. Well, first of all it is not a disease but rather a symptom of disease and while the concept seems obvious, there are actually several medical definitions of the symptom. This is because fatigue is a multidimensional term used to describe feelings of exhaustion, sleepiness, and general lack of energy. Fatigue can be either acute or chronic.
Acute fatigue is generally short-lived, sudden in onset, and relieved by rest.
In contrast, chronic fatigue lasts a long time, is usually insidious in onset, and usually not relieved by rest. From your report, your brother certainly is suffering from some type of chronic fatigue problem. There are many potential causes of fatigue in those of us who are HIV positive and frequently more than one cause may be involved. Your brother's body aches and digestion problems may well be a clue to some of the underlying problems. He is correct in having these symptoms worked-up thoroughly.