Really need help here!?

I hit my head pretty hard. I have a bump. I saw a bright light for an instant when I hit, and now it's time for me to go to bed, but I'm scared and something feels off.

I've gotten bad thwumps before, but this is different.

I was all huffy, and sat on my bed in a huff. But I conked my head on my windowsill, and I saw the light. I could still see outlines, but everything else was white. Then I lifted my head and was really dizzy. So I lay down crying for a bit, and then I'm ready to go to bed, but I get this hunch, beacause I'm a bit sluggish and....I dunno.....Off? So I'm scared, and sluggish, trembly, and my ears started to secrete wax.....Not sure if related or not.

Questions:

1. Chances of concussion?

2. What can I do....Anything that should help?

3. Symptoms of concussion?

4. How long can it take for me to exibit symptoms?

5. Anything else?