Medical help please
so the past 6 months or so I've had extreme head pressure to the point where it causes me to not be able to focus in school. It then causes me to get awful pounding headaches in either side of my head but not both at the same time. recently the back of either side if my head tingles but once again only one side at a time. my doctor put me on a nasal spray thinking it was a nasal blockage but it didn't work so she put me on propranolol for migraine treatment and I had a very rare allergic reaction to it. I couldn't breathe and was nauseated to be exact. can someone explain what could be causing this pressure? like could it be a brain tumor or anything that would involve brain blockage? I'm perfectly healthy other than my weight and I'm 15.