Did you friend ever get to the bottom of this? I had mono 11 years ago, without the fun of having a boyfriend. Imagine how bad a 15 year old gets teased about the "kissing disease". Anywho, mono caused the glands in my throat and neck to swell like crazy. The ones down the back of my neck you normally cannot feel were acorn size. I feels like strep throat except you are even more tired. Nothing cures it but rest.