My experience, not medical advice, it all clears up eventually.
My red face was somewhere around the 4 month mark.
On the mental fog. Looking back, I felt mine was gone after a month, got to 2 months, could now see it hadn't gone at 1 month, but it's gone now .... surely, got to 4 months, could see it hadn't lifted at 2 months.
Got to one year, it must be gone now surely, got to two years, nope I was still foggy at one year.
That fog will take a while, but you'll only see it looking back, sober.