What Causes Hot Flashes, Dizziness And Chest Pain?

I ve been having problems. I have had hot flashes were my pulse seems to elevate and cause severe dizziness with vision that s changing colors and blurry. Chest pains and hard to breath. I was diagnosed with hydrocephalus two years ago. I m on a exercise and diet regimen for weightless so I can have a shunt put in. Any ideas