I was exactly the same, I hated needles, injections, blood tests etc, until I seriously had to have some done. For me it was more the pain I was scared of, but I found the whole concept of blood tests sickening too. I found something to completely numb the pain, a numbing cream called- 'EMLA' 5g cream, bought from an online chemist. This was great, I'd really really recommend it. You dont feel the needle going in, so for you it could reduce the sensation/thought of have a blood test. Helped me get over the fear and the whole thing went really well. Good luck