We have to catch up and talk about this properly in person, but my initial thought is that no employer should be in fear about giving a warning to an employee if it's warranted. If he wants to waste his time lodging bogus complaints to the FWO...I'm sure they're used to dealing with the likes of him!!!
This guy is such a worm, and he will attract so much bad karma.....!!!!
Sorry you're having such a shit time with this. Your mum is so amazing, but so are you. You're both women made with steel, I swear! You're out of your routine... without sleep and taking proper care of yourself, stress is harder to manage. It'll get better and you'll feel stronger next week - and then this turd won't get to you as much. A weekend of rest will do you the world of good!