Also, depending on the specialty you see, that is what you get diagnosed with. If you don't have a +ENA, even with a +ANA, rheumatology tends to not want to deal with you. If you see a neuro without a background or interest in autonomic disorders, even with a + ENF biopsy they don't do much for you. I do think that if you can get to an autonomic disorders center, it helps. If you have autonomic testing and it shows abnormality, and you have a + ANA, it's pretty evident that you have an autoimmune neuro condition.

All possible diseases must be ruled out so a treatable cause isn't omitted.

Treatments for AAG, are very similar to treatments for autoimmune disease EXCEPT for drugs that can harm the nervous system, such as methotrexate, azothiaprine etc.