What Causes The Build Up Of Pressure In Head?

I'm havin an odd feeling in my head. It feels like something is pushing on the inside of my head, or like theres a preassure build up or something. It is in the front part of my forehead and extends up to the top of my head.



I am concerened because I have never had a feeling like this before and I'm concerned that it might be something to see a doctor about. It has lasted for the past two days or so and it comes and goes but at night it lasts almost all night long.



My sleep has been affected and I'm honestly a little scared.



Can you help me?