IVIG is challenging. I started on a higher autoimmune dose of Gammaked and had significant side effects each time for 7 days after. Switching to Gammunex-C, which has the exact same specifications has been better.
It does tend to set off MCAS symptoms, but I'm taking Solumedrol, Allegra, and benadryl the day of, and dexamethasone, Allegra, ketotifen, Benadryl, B5, curcumin, and boswellia for a few days afterwards.
It has given me the support I need to be resolving my multiple infections.
Both drugs will work for CMV and EBV. I've been on 1.8g of Valcyte for 6 months, which has improved my symptoms and my labs.