I've had sinus issues for many years now, and this sounds absolutely typical of an issue with them. It can affect your whole head, and even further down into your chest. I've gone to the dentists with chronic pain in a tooth, convinced it's rotten and terrible, to find out it's noting but sinuses.
Palpitations are also nothing to worry about. And the likelihood of getting an infection into your blood in that manner is ridiculously low. Possibly if you had a weakened immune system. Otherwise, your body is designed to deal with these things :)