I had this surgery (L5 S1) a year ago and since then have had these unpleasant sensations that you all describe: pressure in the ears and temples, a lot of ringing in the head. Once the sensations were so strong, I passed out for 5-6 seconds. Several times mentioned these symptoms to both my GP and my neurosurgeon and they wouldn't say anything. Finally, last week when I had a post-surgery MRI they saw a big (tennis ball size) mass between my spine and the muscles... Now I need to schedule a surgery for the leak. I'm really concerned now not to have it again as I don't even know why I had it in the first place. Some people mentioned caffeine here. Does it really help? I thought I didn't strain myself and didn't lift any heavy things after the surgery, and I still had the leak...