The problem is that ME/CFS is much more complicated than "just" involving the ANS. It involves the immune system, the brain, the muscles, etc. Autonomic dysfunction is insufficient to explain brain abnormalities on MRI, or painfully swollen lymph nodes after trivial exertion, or inability of the muscles to appropriately utilize energy on demand.The key point here is the Autonomic Nervous System. Its affect on every function of every organ of the body. If that has gone somewhat off balance ----- then the question is WHY?
Anytime someone does come up with an attempt to trace these all back to the ANS, the CNS/brain, or pretty much anything else, it involves a lot of vague hypotheses with little practical explanation for the actual mechanisms involved. And expert ME/CFS researchers have been putting a lot of thought and research into these issues. Thus far, the immune system is looking like more of an ultimate culprit, and that can be very tricky to treat even when doctors know exactly what is going wrong with it - and they don't yet, for ME/CFS.
To be a little more frank, we badly need fixing, but suggestions from the internet are not going to do it. Other experienced ME/CFS patients can often offer helpful suggestions regarding symptom management, and some doctors can try various treatments and at least treat us with respect. But for very severe patients, the only real option is to lie there and try to survive while waiting for the science to catch up with the disease. Compassion helps, and advocacy with the NIH or CDC, as does spreading awareness to the general public. But second-guessing the decisions made by a patient or their carers is not productive, even when done with the very best of intentions.