Yes, this is a challenge with PTSD. I get overwhelmed myself if I am trying to deal with too many things all at once, I can't seem to concentrate. I get into hyper aware and fight/flight too quickly. I can feel the chemical build up in my mind that gets me overwhelmed and I struggle where I used to have a lot more patience and control.

You are more sensitive now and that does make it harder to concentrate, you are not alone with that.