Have you tried the deep breathing exercises that I suggested above for your anxiety/panic attacks?

As far as your sleeping problems are concerned you could try progressive muscle relaxation. I use it as part of sleep hygiene (applying good habits in preparation for sleeping well).

The idea behind progressive muscle relaxation is to tense each set of muscles in your body in turn for a minute or so and then let them relax. I start with the muscles in my feet, then calves, thighs, buttocks, arms, hands, shoulders, etc.

In addition you could see a clinical psychologist who has experience of working with clients who have problems with anxiety or panic attacks. Learning CBT methods is often highly effective for such people.

Bumping-- take a second look at this link information..

I think it's safe to say this is enough proof to show that I could have gotten a concussion from a slap to the head, based on this info across numerous sites: (The number of concussions you’ve had. Because the brain is more vulnerable to injury after sustaining a concussion, it may take significantly less force to cause a future concussion. Also, future concussions may result in more severe and longer-lasting symptoms)
How Many Concussions Are Too Many?

This gif also seems to prove my theory as well. If this is how fragile the brain is in the head, then why don't we get a video on from every jerk to the head we make? Many sites seem to site that the brain is as delegate ad a bowl of jello, and this is coming from the professional doctors too. This is probably wjat happened to my brain dyring the slap. https://media.giphy.com/media/NhXhI7kHCwxRC/giphy.gif

Have you sought advice from a health professional about your possible TBI/PCS?

I am not sure that a cartoon GIF is an adequate substitute for this.