As I said earlier this summer i got a new job. I had to walk long distance and use public transportation. cannot use car. Initially, I felt as if a new crash is coming. Suddenly, it started to improve ( I remember the day when it happened. I drank a big cup of coffee in the afternoon (from frustration). I don't normally drink coffee. The result was good au contraire). Sleep quality improved, woke up more rested etc. another thing that left was some kind of brain fog, slight; a feeling as if not enough blood in the head. It also feels that this somehow affects vision. This could be removed by weight lifting, push-ups, barbell, etc. From my experience, exercise until you cannot do more but do not push further. It is difficult to understand when one is strong enough for exercises. Exercises are important just like Dr. Lam said. It was also confirmed by Sherpa.