I feel a slight pressure on the very middle on top of my head and inside my mouth on the same spot?

I feel a slight pressure on the very middle on top of my head and inside my mouth on the same spot, it started yesterday and it went away at night and started again this afternoon, it had happend before whenever I listen the radio thru my headphones really loud, but it went away in hours. I have no other symptoms but that. I dont wanna be worried but if its something bad I dont wanna wait too long to go to the doctor. Thank you