What Causes Terrible Pressure In Head And Behind The Ear After Running?

After running, I had a terrible pressure in my head and behind my right ear. I became dizzy and thought I was going to pass out. There was a place behind my ear at the top against my head that was so painful, I couldn't touch it. After about 15 minutes, the pain subsided. I have never had this before and am wondering what could be causing this.