It doesn't pay to upset your boss when you are looking for a new job. So keep the lid on it and hope you get a good review that you can offer up to your new company.
If you are in a union, make sure you know what your rights are and use those rights to get the best deal you can.
Above all do your job to your best abilty until the day you have left. You can then be proud of yourself, and your ex boss cannot criticise you. Although they are not allowed to openly make poor references. Try and make him wish he hadn't got rid of you.
Your main concern now is to find another job, which entitles you to go to as many interviews as you like in order to get a new job. Nowt he can do about that.
So get those CV's out to prospective new employers.
I wish you good luck.