I just wanted to add to this conversation my own experience. I have had a high viral load for years, and did not know which virus was causing it. In 2014 I started having a little bit of pain in my upper back on the right side. Nerve pain. It hurt to have water hit my skin in the shower, and worsened after sun exposure. I intuited that this was shingles, since it fit descriptions, although I never had any overt blisters. I have low NK cells and I think my immune system was not strong enough to mount an overt immune response. My only symptom (apart from the general viral feeling + everything else of my illness) was one-sided nerve pain. I went to a regular doctor and requested antivirals. I was offered Valtrex and ended up staying on it for two and a half years. Every time I tried to stop taking it, the pain would return. I finally did a low-dose pulsed protocol of nitazoxanide, which was difficult to tolerate but did get rid of this virus in my body. Following that course of treatment, I felt much less viral. Fewer flu-like feelings. I now only have occasional moments of nerve pain in my back, much more rarely, which I assume is due to the nerve damage (?) effects that the virus had on me for those many years.
However I would like to be really clear that I'm not at all cured of ME. My illness is not at all resolved. I don't know where the shingles reactivation fit into the picture of my ME. I think I probably also have enteroviruses or some other sort of virus that needs to be addressed. I have no idea how many years into my illness the shingles started reactivating. I have had ME since 2005.
Note that I live in Canada and was unable to obtain proper viral titer testing for varicella-zoster virus. I requested antibody testing but didn't get an appropriate work-up. I had chickenpox as a child (same virus) so I think it was unclear whether my antibodies were a result of that childhood illness or whether they were diagnostic of reactivation. My GP didn't know and didn't try to figure it out. The proper testing simply was not available to me. But I know that I had shingles and I know that I do not have shingles anymore. On to tackling the next beast, whatever virus it is...