Take a hot bath and massage the hell out of the area while in the bath, that should help.
I feel your pain bro! Sticking 1ml of BD prop ED at the moment, just finished week one so hopefully my next 7 shots wont be so painful! lol I think the body just takes a while to get used to it, I am like that with Sust also - it only hurts for the first couple of weeks.
UglyASS