My ten year old developed a lump on one side of his neck in Sept with no obvious signs of throat infection. It did feel and look like a gland/lymph node but just on one side. 

Some other symptoms he has been having include - 

night sweats, fatigue, trouble eating, dark circles under eyes 

I ended up taking him to out of hours gp around six weeks ago who upon examination saw pus on his tonsil on the same side and he had antibiotics but the lump did not disappear. 

A couple of weeks ago I took him back to his own GP who ran bloods and it came back as positive for Glandular Fever. 

Tonight I can still feel the lump and see it when he is sitting beside me. He has been tired his week. 

Part of me is wondering should I push further or just accept the glandular fever diagnoses although in my opinion he did not seem to have much symptoms for this unless there is varying levels. I remember being off school for weeks with it.