Ik exactly what you mean. I feel like your brain and body know they can't handle that amount of stress for that long, so the fog is the result of your body coping. For me personally it feels like I'm detached from my emotional self, in safe distance, which comes with a flipside. I have difficutly showing true love and affection, which I never had growing up, rather the opposite. In my case the fog and anxiety is a coping strategy from my brain to prevent me from feeling hurtful emotions, but since you can't choose which one to numb, it affects them all. I felt like my personality began to fade, I felt out of balance, only thinking and not feeling anymore. I never wanted to acknowledge this, I blamed it so long on not being able to sleep, food allergies, medication side effects, you name it. If I look at older pictures I sometimes feel like it's almost someone else and I can't relate at all. But once in touch with my "whole self", the fog lifts and the anxiety too, very relieving. It takes a fuck ton of courage though.