In terms of improvement with mental and neurological symptoms, I’ve found the more time goes on, the more improved these symptoms are. That is not to say I have no mental or neurological symptoms now (I have plenty) but things like derealisation and brain fog are generally less severe than the first 6-12 months of PFS and are less constant. Still intermittently get hit heavy with those though.
I’ve had similar things like you describe with the car. One of the weirdest (and it happened frequently for a long time) was when I looked at people from just a moderate distance they would appear to me to look like young people right up until they were a few meters away and they would suddenly be revealed to be old age pensioners. It took a long time before I could walk around a supermarket without head pressure, confusion. I nearly passed out walking around a supermarket one time.
I have practically no stress response now. Even minor stress produces a feeling like a balloon inflating within my skull. Stress can also induce or worsen derealisation or brain fog for me.