he should make sure he washes his hands frequently, this is the most common way germs and viruses get spread.
mono infection can cause severe fatigue and achy muscles.
that is good he is going to see a doctor and get a complete checkup.
he should get his thyroid hormone levels, iron, B12 and vitamin D levels checked as well.
if he has mucus in his throat, he might benefit from allergy medications or acid reflux medications or mucinex which could help
I hope he gets better soon.
let me know if you have other questions.
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you can always reach me with "a question for Dr. David" in the medicine or oncology categories if you have any other questions
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