<s>[INST] i have headaches constently, i get very hot and fustrated and i find it hard to conconsrate. my eyes hurt when i look at screens likes teles and computers, i feel very tierd alot. This is after ive had glandular fever. Do you think it could be anything serious? [/INST] Hello.Glandular fever might be simptom of many illnesses. But in young age it is probably mononucleosis. If I am at your position, I would go visit doctor and do blood check.But lots of rest, oral fluids and fruit food will be helpful for sure.All the best. </s>