Yesterday for the first time I had a rather unusual headache. It seems as if a fluid builds up at the base of my head (back, just below the soft bit) over a period of about 2 minutes. Then it peaks, causing dizziness and blurred vision, along with a normal headache after that. When this starts to subside over a period of about an hour, pressure remains at the area it built up in over night, occasionally causing some recurring minor headaches.

I would have ignored this entirely, but this has occurred tonight as well, after not having a headache for about 2 years. Obviously this has made me paranoid.