I also went home with oxygen. Weaned off of it about 2-3 weeks after. I only needed 1L when I was up moving around. I had the brain fog the whole time. Mine was what you hear covid can do. It slowly got better but some days still are more than others. I am 3 1/2 months past. I learned to write things down right away as I think of them if I know I want or need to remember them. It should get better and better with time.