AS above

I know a lot of my issues are anxiety related and have been referred to see a psychologist about it now however this event has me worried a bit more as it was more than just a light head bump.

I was lying in bed on my side with my partner and I said a joke thing and you know how some people react and push you and be like "excuse me haha."
It wasn't meant to be malicious or anything but I'm a bit worried as I felt the hit/push send me backwards a decent amount. I felt like I had been really pushed back and my head did get jerked back.

Because I read that a blow to another part of the body can cause a concussion, then with me only 1 week into a concussion I am worried that I have reconcussed/reinjured myself?

My head feels pressured but that could be anxiety.
Anyway, I was wondering does it need to be a BIG bodyhit or can a semi-hard push/punch to the shoulder cause another injury, especially to someone recovering?