Hit the back of head am I okay?

On Wednesday I fell back and hit my head and now i have a bump on the back of my head. It's Saturday night right now, i feel fine. But I don't know if I'm actually okay. I don't want to go to the doctors because I'm scared. I mean I'm fine. But idk if I'm safe. Like how does bumps work? How do I heal it? Please and thanks!!