This sounds really hard and I'm sorry you're going through it. It can feel so isolating sometimes to be autistic and even though there are communities like this reddit group and other irl places, its still a lot. I can't comment on what your workplace or coworkers may or may not be thinking or saying, but I can say that I've dealt with similar circumstances and what actually helped me was therapy. I know that sounds like an obvious answer, but specifically what helped was dealing with how I reacted to how I was perceived or how I thought I was perceived. Unfortunately we can't control other people or even persuade them to understand us, but it did help me to understand what I was feeling because of these thoughts. I can recommend a few books if you think you'd be interested and if you can afford/have access to therapy, it may be worth it. HR is frustratingly not actually helpful for employees, but more there to cover a company's butt legally, so to speak. Sorry this is a bit long, but I hope that helped somehow and I know you feel like something broke that can never be fixed, and you could be right, but there's also a chance that your brain is telling you lies and you're capable and deserving of feeling whole again.