My son at 18 years..very swollen glands in neck.Throat septic (quinsy )This was really bad.
Body and limbs tired and needed sleep.He was at University studying but returned home instead of Halls so he could rest better.He managed his timetable by negotiating times.

I made sure he ate a good diet..must keep drinking glasses seperate. also replace toothbrush often.(I still do this)

At school many teenagers developed glandular fever.Perhaps the kissing..also close proximity.
Montain ash