I am a healthy 19 year old female. Recently, I began experiencing a sensation of pressure within the upper portion of my skull. At first, it was brought on whenever I would tilt my head a certain way. Now the pressure is so tight, that it comes on at any given moment and remains present for quite a while. I haven't yet experienced any other symptoms such as dizziness or loss of orientation. However the pressure does bring on a slight sensation of pain, similar to a headache. The feeling of pressure becomes more prevalent during times of high heat and humidity, but those are not the only factors which trigger it. I have felt it sitting straight up, as well as lying down on my back. The sensation is even more prevalent when lying on my belly. A few weeks prior to the sensations of pressure, I also experienced a few small episodes of rapidly brought-on dizziness. I have no idea what could be causing any of this. Any suggestions?