Thanks for writing your query.Headaches
can occur as a result of cold and fever. It can also be due to sinusitis
Single sided headaches are usually due to migraine attacks, which can be aggravated during cold and fever.
You should follow some precautions like :-
1. Don't miss a meal.
2. Have adequate sleep.
3. Avoid mental and physical stress.
4. Avoid smoking/alcohol, if any.
5. Drink lots of water daily.
You should get yourself clinically examined by your doctor.
Painkillers like Ibuprofen one tablet twice daily after meals along with an antacid like Omeprazole
40 mg will be beneficial.
Steam inhalation will be helpful in case of sinus headache
Also get your eyes checked for refraction
by an Ophthalmologist.
I hope this is helpful to you.