You're a strong girl, Lex. You'll get through this, even though it does suck. I couldn't believe how little my ex knew about what it cost to raise two children. I eventually quit trying to get it through to him during his active addiction and dealt with stuff myself. It all worked out fine and my kids and I suffered less stress because of it. I totally agree with just taking the high road. Remember, you have not been self-medicating and have "grown up" like a normal human being. Your ex is still stunted in maturity. His tit-for-tat game of bringing the police is probably an attempt at paybacks for you calling the police earlier.
On an immature note, I loved it that you were in the shower when they came and he had to have then realized you changed the locks-LOL. Sorry, just couldn't resist.