Thank you for the information,
It is Infectious Mononucleosis commonly called Mono.
It is also known as Glandular fever.
It is caused by EB virus.
It is a common infection.
The symptoms are similar as you describe.
The symptoms can last for months but usually gets resolved without complications.
Treatment is mainly symptomatic.
Taking rest, adequate fluid, nutrition & medicines for pain, fever are usually enough.
It is often transmitted by body fluids like saliva.
So it is also called Kissing disease.
I hope this information helps.
I will be happy to assist, if you need any clarification.
Please feel free for any follow up query.