Although no one can give you a definitive answer, I think if you've been on a drinking schedule of every weekend or every other weekend and you drink as much as you did (20+ beers for days straight) it can be a form of PAWS. Thats a lot to be drinking and if you've done it for years it can eventually catch up to you. I think you did the right things by checking with dr's/neurologists and deciding on quitting drinking. Im in my late 20's so I can relate when you say that drinking and beibg hung over has become tiring and "old".
People say that PAWS can peak a few weeks after quitting, or 2 months after quitting etc. Everyone is different for this depending on how much they drank or how often. Try not to panic too much because you have taken some steps to help yourself and if it is PAWS it takes time. Welcome to the forums!