I have arterial compression on both sides, with the left being worse. Therapy seemed to help the right side, but surgery was needed on the left. I had the surgery on the left in Sept. 2011. I could not get off the couch. If I turned my head or raised my left arm, I felt like I was going to pass out. My verterbal artery would completely stop flowing. The doctor said it was very rare, but had seen it before and actually thought I was going to have reverse flow which she seen only once. Still have a lot of pain and spasms in muscles and dizziness on occasion, but I can function a little bit better. Still can not work.