If it's the thought of the injection then you are going to have to see a therapist (if it's become that much of a phobia).
Otherwise, grab yourself some Emla cream (pharmacist only medication). Just apply a nice layer, leave for sixty mins or so under an occlusive dressing and hey presto- you won't feel a thing (unless its a very large needle
)
I use it all the time, especially on the "little ones", as long as it's not an emergency presentation
Enjoy!