Hello dizzyd, by your post I think you've still got your sense of humor, at least some of it Everything you're experiencing is normal at your stage of quit but the good news is that it's all temporary.
As far as the brain fog, I found eating sweets helped with that. For me it lasted almost a month I'd say. My grumpiness lasted a bit longer and I think it was honestly around the six month mark that I started feeling better.
It's important to remember that we are all so different in our quits so time lines for me won't necessarily be the same for you. I also quit more because I had to and not because I wanted to so that makes a huge difference in how your quit goes too.
I think you're doing awesome, congratulations on being done with hell week. That's the hardest week of all!