http://www.ncbi.nlm.nih.gov/m/pubmed/17511060/
http://www.ncbi.nlm.nih.gov/m/pubmed/21305447/

Ginger is one of those herbal remedies for nausea and vomiting. Maybe you could just have some ginger ale everyday? Course, this is just a preventative measure, in order to get over your fears you do (unfortunately) have to face them. At least ginger ale might be tasty, I've never had any.