This has been happening for about a year and a half. I will get a burst of pain on the left side of the back of my head and it kinda feels warm like blood is leaking out. It feels really deep (like under my skull) and the pain lasts about 10 seconds but almost all the pain is right in the beginning. It has happened about 5 times so far and each time it happens there's doesn't happen again for a longer period of time, but each one is more and more painful. It happened to me today and it was so painful that I almost fell. I'm only 14, and I'm wondering what's going on.