You’re welcome. I’m not saying a that’s what it is, but the symptoms are familiar.
There are a number of other conversations in our forum talking about a reactivation of EBV that you might want to take a peek at. https://connect.mayoclinic.org/discussion/is-chronic-reactivated-epstein-barr-virus-different-from-chronicle-ac/

I hope you get some answers soon. Will you let me know what you find out?