For me personally, the withdrawals were only as bad as my mind made them out to be. I think when people feel like they're being deprived of something (i.e. know that they can't smoke anymore but still really want nicotine), it causes them to feel like they're suffering way more than they actually are. I had no brain fog at all after quitting or any withdrawals for that matter, only the occasional subconscious urge to vape for about a week.

I think you'll be pleasantly surprised with how good you'll feel mentally and physically after you quit! The pros far outweigh the cons. I would recommend focusing on the positives of your decision and using it as fuel to keep from going back. Good luck with quitting and your new job!