I remember I had pretty bad "brain fog" for the first week I was quit. I was pretty much useless at work for a couple of days, that's for sure but it's just something we have to endure and do the best we can.
In terms of nicotine supliments like gum, spray or patches, it may take the edge off the worst of the early withdral but it's NOT a magic bullet for quitting as some seem to think. Believe it or not, nicotine will be completely out of your body after 72 hours (3 days) if you're not using a supliment. Maybe keep that in mind before you start adding nicotine back into your system?
Stay committed no matter what challenges you face. That's absolutely critical. The longer you remain quit, the more you have to lose should you light up again.
They don't call the first week of your quit "Hell Week" for no reason. It truly is the most challenging part of quitting! But, you're developing tools to fight with now that you've quit. Try whatever you think will help distract you and get you through those really hard days. Time probably seems like it's standing still for you right now but when you look back on these days later when you quit is stronger, it will seem like the blink of an eye. Hang in there @susie14!!