It is most likely coxsackievirus B4, by my symptoms and blood tests (performed using the plaque reduction neutralization test, which is the only blood test that, by Dr Chia's research, can reliably detect chronic coxsackievirus B infections).
This is similar to me: my mild sensory symptoms and major body-wide paresthesia symptoms occurred after a few months with the virus; but it then took another 2 years before I developed proper ME/CFS (although some mild fatigue symptoms were there even in the early stages of this viral infection).
I was also able to observe the effects of my virus on other people, as many friends and family caught it (my virus produced some characteristic physical symptoms, so it was easy to know who had caught it). Three people had a heart attack on first catching the virus, in one case, followed by chronic viral myocarditis. Coxsackievirus B is a common cause of chronic myocarditis, and is associated with heart attacks.
That sounds quite possible, though your skin numbness and skin sensory symptoms could be due to the same infection that later triggered your ME/CFS.
This is what I believe happened in my case: the suspected coxsackievirus B4 I caught first triggered some peripheral neuropathy in me, and then later triggered ME/CFS. It is not unusual for the same virus to cause more than one disease or condition in the same patient.
I had several different medical conditions triggered by my virus, including: chronic paresthesias, loss of smell, sudden onset periodontitis, strange crêpe paper-like wrinkling of the skin, sudden onset abdominal obesity (central obesity), and sudden onset of neuropsychological symptoms such as anhedonia, and generalized anxiety disorder.
All of these appeared before my ME/CFS took hold. I detail the symptoms of my virus on
my website.