Hello! Welcome and thank you for asking on HCM! Your symptoms may be caused by a viral or bacterial infection. From the other hand the headache and sinus pressure may be related to sinus infection. I recommend consulting with your GP for a careful physical exam and some tests: - a sinus X ray study to exclude possible sinus infection - some blood lab tests (complete blood count, inflammation tests) - a sinus discharge bacterial culture to exclude possible bacterial infection. If a bacterial infection is confirmed antibiotics should be started. I would not recommend starting antibiotics without a medical consult and the above tests. Hope you will find this answer helpful! Best wishes, Dr. Aida