Fallen off?

Hi, today I fell off my 2 year old saddlebred because he got spooked. I fell off(of course) and when I was I was on his left side of his neck and he reared up alittle and I thats when I fell off. When I hit the ground he was close of stepping on me. I was fine, got up and lunged him with no one on and had him trot about 10 mins to clam him down. When we were done with that I got back on him and I was confident. But now I am still a little scared. I have fallen off before too. Any help to make me more confident?