I know this is a pretty old thread but it is an excellent thread. I can relate.
I think I'm fairly lucky
@Hip because it seems my ME/CFS is relatively mild (or has been so far) That said, last year was a year of feeling almost continually ill. Sometimes quite horribly so.
But what you describe with the CoxsackieB virus...many, many of those symptoms on your list I can relate to indeed.
In my own case though I am not sure it was CoxsackieB. The incubation period was 48 hours, not 12. I had no sore throat nor fever, nor overt upper respiratory symptoms.
Prior to getting ill (suddenly at 2pm on 27th March 2018) I was -strong and fit for my age (64 then), athletic, healthy, resilient, with a good strong immune system. My character was friendly, quite sociable -(though I did like quiet times of reflection alone, and country walks alone.) Very active, with my brain often running ahead with ideas, things to do, fixing stuff (building a garden bridge, making new fences, ) excited by writing projects, creative generally, had spiritual warmth and positive heartfelt emotions never far from the surface. Great sense of humour always ready for a laugh.
In the first week of illness I went very quiet and "asked" my body (yeah, I know that sounds odd !) -what was the matter with it?
After a few moments I "heard" the answer come back:
"Something has got inside me and is trying to change me"
and
"There are poisons produced as a result"
(Bear in mind I had done NO health research previously. I never needed to -except for animal health research occasionally.)
In the 16 months since, I have experienced many of the things on your list. And the most upsetting "symptom" which was definitely sub-clinical, was a feeling of profound sadness at times -great sadness because of a loss of things I held most dear.
Those things were the enjoyment of my life generally; my simple enjoyment of things had disappeared.
At first I gathered it was because of feeling unwell so frequently, and to be expected. But then I noticed the loss of enjoyment and ability to "feel with" those things I hold dear was actually one of the symptoms at the core of my unwell-ness, and strangely had been since day 1.
i.e. That was one of the initial symptoms that came along with a handful of others at 2pm on 27th March 2017.
I have a very strong heart. Yet I was getting very worrying cardiac symptoms. I have a gut like cast iron -never get gut problems, never go off my food, etc. Yet I was plagued with upset belly.
I never get post-nasal drip or issues with mucus....but I started getting that sometimes on waking in the morning.
I never get headaches.....ever....but got a constant nagging pain on one side of my forehead.
Meanwhile, all medical tests were coming back as "normal".
Yes I started feeling depressed sometimes, and I never got that either before.
Couldn't see the blue sky. Couldn't hear the birds. The wind had no scents in it. Looking at the ground when I walked instead of ahead. Food lost its excitement. Pleasant dreams gone. I started getting nightmares, which I'd rarely had before.
Had to wear earplugs to sleep as the slightest noise would wake me. (I used to sleep through hay-trucks pulled by tractors going by my bedroom 10ft away!)
Stress....became more hard to handle. Even the tiniest little rattle in my car would have me shaky! Filling in a form for the Council....same effect.
Looking at an animal, I could feel no connection. I would be kind to it, etc, but the heart connection wasn't there....and that scared me. That really scared me.
Yet I somehow knew that this was NOT clinical depression. As far as I know, clinical depression does not suddenly start at a particular time on a particular day, with bad flu-like symptoms, a feeling of coming down badly with something, and upset gut. I would have had some warning, had it been that -I am sure.
I couldn't even fight it. Couldn't reach around those symptoms and contact the "real me."
But I kept on attempting to, and trying not to be too upset with nil results.
Sometimes the fog would lift, and life seemed to come back. Those days became very precious.
It isn't hopeless. I would like to say that -at least from my own experience -there have been oases of normality. They do seem to be slightly and gradually increasing as time passes, but I don't wish to tempt Providence, and know that anything can happen.
But it hasn't got worse, so far, and there are now a few more glimmers of light, and quite a bit of my normal "bounce" HAS returned to me, even though I do still go through "crash" periods at times.