This morning, I was walking/running to a neighbor’s house for 30 minutes. It was raining a little and it was around 45 degrees. After a while, I started to get a pain in the back of my head and behind my ears. The pain got more intense and started to hurt even more when I touched it. After I got home, the pain started to go away but it’s night now and I’m in pain again. Why is my head hurting so badly?