I'm sorry you are going through this.

I'll be blunt. I believe in the UK (as in NZ) a statement of truth or opinion is not defamatory. One would still have to go through the motions though, to prove it.

Reading the blog post I am left with the feeling you are on thin ice. You don't qualify it as an opinion and it doesn't sound you have evidence to support the claims. Screenshots may not suffice. You would need witnesses and statements or documents to prove it.

You will need these if the person unmasks your address and brings a case to court.

As usual IANAL.