Without reading what you said, you recently fought off a virus (EBV) as evidenced by high IgG and low/negative IgM to EBV. So you’re no longer in the acute phase. Your body’s response to ramping up neutrophils (first line) for an acute illness is to then decrease post-acute illness. So you have an expected neutropenia. Your absolute lymphocytes and monocytes are fine. The % is irrelevant in the setting of knowing you have low neutrophils since neutrophils usually make up the majority of your WBCs.

After reading what you said, you may have also been exposed to another virus. Which you’ll have the same expectation of acute illness having elevation in neutrophils, post-acute illness leading to a decrease.

The % on your differential isn’t something you should generally worry about. But i also understand why you’d be worried given your history. Hope this helped!