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.
Throbbing tooth pain is often associated with inflammation in or around the tooth caused by: infection in the center (the pulp) of the tooth; infection of the gums; sinus infection; cracked or chipped teeth; broken crowns or fillings; Whatever sort of pain you experience, sharp or throbbing, your brain is telling you that there is a problem that needs to be fixed. How to Relieve Throbbing Tooth Pain