Dear Warren,
Glad to hear you still have your job but of course sorry to hear about the conflict with others. Good for you for sticking up for yourself in a calm and factual way. It's hard to do, believe me I know, but it's the right way. A friend of mine once suggested that it's best that we "hold the high ground" when in these situations. This means that we do as you did, not descend into childish behaviors as she did. That way, even if she refuses to listen or continues to attack, you'll know in your heart that you did the right thing. And hey, if it gets escalated to your boss no one can fault you for how you handled it, right? :-)
Regarding the counselor: yeah, it's hard to think about opening up, especially after so many others haven't really listened. He or she may very well be one more of the same, for sure. More likely, that person is a trained professional who really wants to help. So if you detect that they aren't really listening or hearing you (or maybe also wondering it's "just a phase") call them on it. Just like you did at work: calmly say something like, "I don't understand what's going on here at the moment, and hope you can help me. I'm telling you what's really going on for me but I'm not sure I'm being heard, which worries me because I really want some help. Am I misunderstanding something?"
Best,
Emma