Honestly, I don't know if the injection is going to help you either. If you had less symptoms taking the pill form of Abilify, I'd bet that it would though, and the only way to know is to try. Perhaps you could come up with some sort of mantra to say to yourself how you're going to stay calm, the nurse will take care of you when she gives you the injection, you're doing good for yourself with this, or something along those lines?
I was initially given my risperdal consta in the hospital, I was nervous too, but I'm glad I went through with it because when I started it I had much less psychotic symptoms and went months without any manic symptoms.