I've noticed something similar.

I think a part of it has to do with suffering from the severe fatigue that this concussion has made me deal with and understanding that I have to choose where to put my energy - I don't even have the energy to deal with more than half the situations that I could deal with before the accident I was in.

Sometimes I don't have the cognitive ability to deal with issues either like I could before the accident. But that's improved a great deal in the last year for me.

I think another part of it is that this injury has really put things into "perspective" for me. Like, that thing that would have bothered me before the accident aren't really a big deal after having to deal with such a horrible ordeal that the car accident I was in made me suffer through.