No matter how scary it is I'm going to overcome it somehow with love or good thoughts.
I may have misunderstood the theme of this thread, but I think by allowing the shot, you allow yourself to experience negative stimuli from a place of safety. We can't always avoid negative situations in life (like getting a flu shot, for instance) but we can work with those experiences in a dream to lessen the pointless distress we might face in WL otherwise. For example, by facing the shot in a dream, you can lessen the negative associations surrounding shots by experiencing it in a dream. It's not real anyway, and it probably won't hurt as bad in the dream. When you experience it again in WL, you can transfer that bravery from the dream state to the waking state. There may come a day when getting a shot is no big deal. Practice for waking life.