@Wishful How are you measuring your muscle damage?
I wasn't measuring. It's just that the trigger for my PEM seemed to be usage of muscles in ways that I didn't normally use them, which as far as I know, results in microtears or other such damage, which triggers immune cells to clean up the damage and stimulate cell replacement. If I was used to 40 km bike rides, they wouldn't trigger PEM, yet climbing a ladder (which strains the muscles differently) just once, did trigger PEM. Likewise, shovelling soil with my normal movements for hours didn't trigger PEM, but shovelling a small amount of soil using different movements (stabbing horizontally) did. I assume that the main difference is the amount of cell damage. I suppose there are other possible explanations, such as signalling along different neural pathways, or different mitochondrial arrangement in the lesser-used muscles, but the immune system triggering seems the best fit.
I just looked up the symptoms associated with autonomic nervous system dysfunction, and I don't have any of them that I'm aware of. I suppose my double-vision could fit under their vague 'vision problems' category, but it could be from other causes too. So no, I can't put autonomic nervous system dysfunction as a symptom for ME that we all have in common either.
Going by the Canadian Concensus Criteria, we have fatigue (poorly defined) and PEM required for the diagnosis, with sleep dysfunction and pain (both kind of vaguely defined) required with some exceptions accepted. Also, it has to last for more than six months.