Hi, I went to sit on my couch.. And sort of dropped myself into it. While doing this and letting my head fall back into the couch, my son came up behind the couch and started leaning over the back. Our heads collided. He. Knocked the top of his head, and I knocked the lower back left side near my neck. I have a big bump, he has nothing. My head hurts a lot, and I've only made if hurt more. Should I be worried.