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.
Can Tooth infection cause tinnitus? I got tooth infection because of a wistom tooth, and my ear ringing all the time, feel pressure in my ear and got headache too.