Find a neurologist that is familiar with chiari, and that can explain things well. You will have lots of questions, so it's great to be able to understand their answers
Connect with others with your illness. There is no support like support from someone who knows what it's like to have Chiari. Facebook offers some excellent private groups.
I try to eat a really healthy diet (no junk food, sweets, caffiene, etc) and I drink a lot of water. I find one thing a day to be grateful for in life.