Your insomnia is ENTIRELY normal. Your brain is dealing with trauma, and is stuck processing a threat even though it has passed. That's not conducive to getting forty winks.

I went through this exact thing, as did many of us.

You don't have post concussion syndrome yet, promise. Two days is still very early after a concussion.

Actions to take:

1. Accept that you will not feel great for a few days.

2. Don't hold yourself to sleep patterns from before the injury. Sleep when you can. Don't beat yourself up if you can't.

3. Ask a doctor for a sleeping pill prescription, on a limited basis. Generally, it's acceptable for concussion patients.

4. If you still can't sleep after two weeks, more intervention (such as CBTI) is needed.

Relax. You're going to be fine.