How can I tell if I have a minor concussion?

I was in a wreck last week and ever since then my head has hurt and I can't remember somethings that happened in the wreck. I was driving and I might have hit my head but I can't tell. My passenger didn't see me hit but she wasn't looking. How can you...

I play football almost everyday and almost always get hit hard in the head. I often come home feeling dizzy and having a big headache. I want to know if there is a way i can self check if i could have a concussion?

I got a concussion on monday.. and my head still hurts >.< I know I still do cause my head still hurts from it, but when can I play hockey again?

My cousin banged my head against my other cousins head pretty hard. It only hurt for about 2 minutes and then it went way. Now 2:30hrs later I sort of want to throw up and have a minor headache. A 1 or 2 on a measure of 1-10 I'm scared of going to sleep...

I was at work today and I went to put a vase on a glass shelf, when I put it on the shelf it broke the glass and I got smacked in the head by 3 vases. I sat down on the floor trying to just relax and I realized I had two huge bumps on my head. I put...