I get a horrible headache anytime I lean back or lay on my back. I was told that sometimes happens after placement, but I wonder if it's just another pressure issue. I also developed a Chiari Malformation from the shunt, so wonder if that's really the issue now. My daily headaches are gone & I didn' t have spinal pain again until today..I went back to work today after shunt revision four weeks ago, so not sure if it's body adjustments, muscle memory, or pressure needs adjusted. Any thoughts?