Whenever I have had to have an injection, I've tried to rationalise my fear by telling myself  "it could be so much worse - sure, the 'flu jab is scary, but it's not like it's a bone marrow biopsy or anything". The idea of that particular procedure terrified me so much that everything else paled in comparison, and I was just glad I never had to face it.  Until I did have to face it.