I've had pcs for 5 months now and it has been getting a little bit better every day. But today I'm afraid that I've ruined all of my progress.

I was playing with my 4 year old brother, he was lying on the table (don't ask
And I wanted to tickle his tummy. He was suprised and accidentally hit my head with both of his fists. Now I know that a 4 year old doesn't have a lot of strength but I am still afraid that he gave me another concussion! Could one get a concussion from that??

I feel a little bit dizzy right now but I don't know if it's from the panic or if I've done some damage to my brain

Please can someone tell me if I can get a concussion from this ?? Should I even worry about it??
Thanks for your help