I kept a list of things that actually happened

I started writing down what was said, and when, in a plain notes app. Not for revenge. Just so I would have something that could not be argued away.

On the hard days I read the list. It reminded me that I was not imagining things and that my instincts had been right all along.

If you are in the middle of it right now: your memory is not the problem. Write it down.