Hello, this is Dr. David. I have read your question and I'm ready to help.
ebstein barr virus IgG positive means you have had exposure in the past to EBV virus. IgM positive means you are batting a current EBV mononucleosis viral
you should get an EBV IgM to see if that is positive.
you need vitamin D supplements as well.
another possibility is that you are suffereng from worse anxiety disorder which can get worse if you are tapering down on the Brintellix. severe anxiety disorder can cause fatigue, muscle weakness, joint pains, cramping, GI issues, headaches, cognitive confusion.
fibromyalgia can also cause these symptoms as well.
make sure you have gotten your thyroid
hormone levels and iron ferritin levels checked as well
let me know if you have questions.