I would remember that you have more power than you think you do as EslaMars has said. I had a similar problem arise, and when something like that started to go down, I pointed to how I was outperforming everyone in the company bringing in revenue.

Also, when you walk into a meeting like that, you have absolutely the power to say, "I want to adjourn this meeting until I can have a representative available to accompany me." Then you find a lawyer or a disability advocate or just a really level headed friend who you introduce as your counsel come with you so they can defend you against the accusations level-headedly.

I think you always have to be really careful about how you go about things with HR, because, yes, they are there to protect the company. You have to be extra careful about documenting and keeping copies of everything.

I had a boss who tried to fire me because I requested information about our company's long term disability policy and how it worked. And he put it in an email. He stupidly put a lot of things that were illegal to say and do in email and I, not only printed them and sent copies to myself and my private email address, but I showed them to HR and our board of directors and said "your CEO is a huge liability and he's illegally trying to fire me for having a disability." I ended up going on long-term disability and leaving the organization, and they never did anything to him. But I did consider suing for discrimination. In the end I was just too tired to deal with it.

I hate to say it, but when you go to HR, you have to be on the defensive, have researched and know your rights, have plenty of documentation, and know how to fight back before a fight ensues.

Start looking for another job.

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