Re: my son has been diagnosed with ebv in his blood work
I think you shoud, and if it is possible I would get a second opinion. Instead of taking him back to the original doctor get a second opinion. There is no harm in doing this, if only it is just to give you piece of mind.
Demand they test for lymphoma, if it comes back negative you have ruled something out. This is your child, go with your instinct and do what you think is right. Don't ever feel you worry too much, that's what mothers are for!!!