I had mono a few years ago. It was no joke. I couldn't eat for about 2 weeks, especially since as soon as I was diagnosed with mono, I got strep throat. Iwas drained all the time, and basically bed-ridden. It actually took a long time to fully recover, cuz I guess my immune system was severely weakened by it.
To everyone making fun of him like it's some STD you catch from skeezers, do a little research into it.
Good luck though my man. If you've already been to the doctor just follow their advice, and try to take it easy.