Hello Lisa, I was one of the first people on the planet to have this procedure. What I don't understand why all these issues. I have had 4 revisions, total. Three before I was ten. The last 28 years later. I have had a headache 5 times in my life, all required surgery. I can't say I have ever the foggy/confused feeling, I can tell you I know exactly when the shunt is blocked, I generally wind up getting vertigo, I have been told that there are only two ways to detect an issue with the shunt, ct scans and mri's don't work. The two ways are a spinal tap and also having an opthamologist see if the ventricles in the back of your eyes are swollen. I can tell you however disconcerting the following may sound I was recently diaganosed with epilepsy. I am unfortunately a guinea pig, I will keep you up to date if I am diagnosed with anything else that my neurologist may feel could be shunt related, doctors have to be a little more reactive with me than proactive, it is a learning experience for all of us.