I was falsely accused and now I am constantly being harassed about it. What can I/my employer do?

I was accused of sexual assault, but my employer found that the incident was not sexual assault based on video surveillance. I had asked the accuser to move because she was in the way of me finishing my work. When I moved around her, she said I touched her inappropriately, but the video shows I never touched her. The accuser’s family member also works with us and is now harassing me at work about why I still have my job, telling me I can’t go into certain areas in the workplace, etc. She was told by our employer to drop it and leave me alone. She is saying things to my coworkers about me while I am just trying to do my job, which I’ve been at for 25 years, but now I’m at the point where her constant harassment is causing issues with my health. Isn’t there something my employer can do? I work in a restaurant in NY, so we don’t have an HR department. I am at the point where I just want to quit because I fear getting a heart attack from how angry I get from this harassment. What can I do besides leave my job?