Hi have had a magnetic shunt since Feb 2010 when I had a shunt blockage. I have had issues since. The setting has been altered up and down on several occasions and I am still suffering headaches. I only have approx. 30-45 mins maximum of concentration at any time. I was told the shunt blockage affected the brain more than they realised but I have been given no real answers to any solution. I also suffer light headedness and not sure whether it due to the shunt or not? Access to my Neuro Surgeon is hard for me as we do not have one in my town and he only comes up monthly.