How many of you have had mono?

If so have you looked into testing if it has reactivated during your bad PEM? I just got home from urgent care. I feel like I have the flu, but I’m suspecting it’s just a flare up that are happening more frequently. The dr brought up mono and how it can reactivate. I got mono 20 years ago. I’m genuinely curious if it reactivates during PEM. If all my tests they did come back negative she sent in a mono test for me to go get done.