Help baby hit his head on hardwood floor

Kristen

I was reaching to get his toy and he was sitting on his playmat and threw himself back and banged his head on the hardwood floor. I feel so horrible. He screamed so loud and was crying and crying. He wanted to take a nap when I finally soothed him but I called my mom and she told me to keep him awake. I called the doctor and am waiting for a response. He's 8 months old. Has anyone else baby hit their head hard, we're they okay???