Welcome to HCM
We understand your concerns
I read through your problem description. I don't think you have anything to worry. Better you believe the doctors who treated you, or find another doctor whom you can believe.Sinus infection
do cause headache. Headache can be frontal, occipital, around etc,. Depends on where is the infection. You need to cure the infection to get rid of head ache. Treatment with antibiotics is the correct option. Your doctors are doing the right thing.
In case there is no respite, do consult them again after the antibiotic course, and they shall advice you further. In the meantime do steam bath
and steam inhalation. Just don't worry. Worrying causes anxiety
and anxiety worsens the pain.
Hope this answers your query. Available for further clarification.