Can you explain more Anthony? with an example please?

For me personally I get this when I talk to my therapist or anyone else in depth about my car crash. I get it just at the point just before impact, then there's a bit I dont remember at all and just after. I find it very hard to explain it, talk about it or go there at all. I cant talk, stutter, get stuck, like there's a problem with my hard drive.

Is it just detachment? Because its too much to go there? I used to be the same with the way I felt about the other driver. I felt nothing. Everyone wanted me to be angry but I wasn't. I was numb towards him. I am getting more angry with him recently so somethings changing.