Hi bg, I can pretty much tell you what it's caused (at least if this is ALL viral related, could be other infection along with it like cavitation), but here is what happened after I got it.

A feeling of movement/chills throughout the head (brain).
Sore throat with strange spots/circles at the back of my mouth.
Personality change, more withdrawn
Worse depression
Severe intolerance to toxins and becoming poisoned very easily and remaining so.
Unable to heal properly after any incident
Ongoing distressing gut issues and any toxins that get moved around, usually now go straight into the gut and cause extreme agony sometimes, or just a feeling of continual heaviness
Unable to move around much, if at all sometimes
Intolerance to exercise (causes worse delayed virus symptoms, sore throat, fever, very ill)
Exhaustion
Feelings of terror for no apparent good reason
Strange thoughts
Loss of appetite or excessive appetite
etc etc.

This could all be related to many things at once, and some of it may sound like mercury but I was already healing before I got this infection and this is what came after it, plus after dental work things got even worse (wisdom tooth removal).

With that is no doubt candida and other infections, so they all tend to offset eachother.