Head Injury? Concussion? What should I do?

I was with my friends not too long ago. We were hanging out, and they said I tripped and hit my right side of my forehead almost near my temple. They said I fell over and what seemed to look like a small seizure. They said I kept begging them for us to leave somewhere, they were agreeing, but for some reason I kept asking. What seemed like forever was only a short amount of time, I finally stood up and started walking. They told me what happen, and I was quite frightened. My walking was a little off at some point. We arrived at McDonalds, and I sat down. I couldn't really read my texts and I think I had a headache. When I got dropped off at my house, I was extremely tired and fell asleep for an hour and a half. I woke up and a small head ache and a bruised forhead. I was wondering what the hell had just happen. I kept wondering if I have and concussion or some kind of head injury. I'm really freaking out right now. I've been searching for answers if sleeping can some times reduce symptoms and relive pain. Since I have less head ache pain and not really confused, dizzy or sleepy ( Of course I could sleep if wanted to since its night time). I was wondering if I'm safe to fall asleep. Can someone tell me please!