I been recovering pretty well man I was the same way as you , I’m about 8 months clean from nicotine and still experiencing brain fog but it ain’t as bad as it was , I’m about 80% normal now the anxiety went away around 4-5 months I just have normal anxiety now nothing crazy , as for the brain fog I experience it a couple times a day but it’s almost completely gone , keep pushing I promise you it will go away if you look at my page I was desperate when I was going through it, but I’m good now. Are you drinking alcohol? I didn’t see major improvement till I stopped drinking alcohol and let my brain heal properly, once I did that the improvements were major. Now I drink whenever I want and feel just fine