Most medications do not prevent you from donating blood. Common medications such as those used to control blood pressure, birth control pills and over-the-counter medications do not affect your eligibility. If you have recently taken antibiotics, you must have completed the course prior to donating.
Yes, a tooth infection can cause a headache. Also, be aware that certain sinus conditions can mask as tooth problems.
Tooth Damage: A fractured or decayed tooth near the sinus cavity has similar symptoms to sinus tooth pain. Tooth Grinding: Tooth grinding (bruxism) can cause pain similar to sinus tooth pain. Gum Disease: The early stages of gum disease can also cause pain similar to sinus tooth pain.