Anxiety can cause all of your symptoms. It appears you may be overdoing looking for and assessing symptoms. OCD can cause you to be this way.

You would be better off to not try to identify a causation. It is not possible to accurately do that. It will just drive you to exhaustion trying to do it. Some even get stuck trying to replicate events/impacts to see if it causes the symptom.

The important thing is to prevent a repeat performance. Your father should never be allowed to smack you again. Your friends should not either.

So, did you get a concussion a year ago? What happened and what were your symptoms? How long did they last?