withnail,
Good Morning.
Confirm with your doctor or pharmacist how much acetaminophen you can take at one time, how long you should wait between doses and the maximum dosage you can take in one day.
Take the minimum amount of medication necessary. IMHO 1000mg of this medication every 2 hours is over the recommended limit here in the USA.
I would check with your Dr. if you are still feeling sick as well as discuss the use of your paracetomol (acetaminophen) with him.
Whenever I am sick it causes my anxiety to run on the higher side as I don't tolerate being sick and down and out well.
Remember I am not a physician so do check in with your clinic.
Glandular fever is commonly known as Mononucleosis in USA - FYI only.
Kindly,
Kitt