Head Pressure an wisdom tooth infection

I have an infection in my right bottom wisdom tooth, which has reached down to the nerve, i am on penicillin vk 500 mg, hopefully in a couple of days i will be getting it removed, but i have been getting a really bad pressure in my head, feels like my brain is squeezing and wants to explode, its very constant, almost every minute i have it, but sometimes its really bad and painful.  most of the pressure is coming from the left side of the occipital. I dont if this is from the tooth, if it is can some explain why?. if not what can it be? thanks once again