I Have Spina Bifida And Hydrocephalus With A VP Shunt.

I have spina bifida and hydrocephalus with a VP shunt. I also have kidney disease and I'm on dialysis 3 times a week. When I first started dialysis a little over a year now, I was in hospitals and rehabs for six months due to many issues, before I went home. At first I was getting headaches, but they gradually got less. Then I went home and started dialysis at an out patient clinic. Ever since then I got horrible headaches. Some days they weren't bad but every time I go now they are excruciating and I have to end my treatment early.
Before the headaches start, I get bad pressure in my head too. The pressure always starts 1 hour into treatment. I'm only on for 2:15 minutes but I can't even go that long. A few months ago the lady in charge changed the settings on the machine and for about 5 treatments I did really good and only started to feel bad at the end. I was really happy for this. But then I started to get the headaches again. I asked if they changed anything and they said they didn't. We also thought it might be the dializer so they got a different one and I still get the excruciating pressure and headaches. Is there ANYTHING I can do to get rid of this. Thank you.