You are working as a R2 Family Practice Resident in a small town. You are seeing Mr. Filledhead, a 62 year old male with known lung cancer. He is presenting today with new onset headaches. He gives the following history: “It’s weird Doc, I get this wicked headache every morning that seems to go away when I get up and start moving around. It sometimes comes back when I cough or sneeze, but then it goes away again after about 10 minutes or so. I didn’t think much of it when it first started about a month ago, but it’s only gotten worse and the other day it was so bad I thought I was going to throw up”. What is Mr. Filledhead describing?