This not only horrible to hear for your sake, but is unethical and even actionable at least in the US. I was a professor at a major University and even with students who were acting out and disruptive in class and also threatening to me, still we had lots of rules about what we could and couldn't do, to protect them and their rights.

I have also been in graduate school where I was open about my diagnosis. It was a big mistake because many people just can't deal with it appropriately. Not saying you did anything wrong or should change at all. Just something I have gone through that made me more cautious.

There must be someone at the institution that handles these types of things. It is intimidation and almost abusive. No one should have to endure that. Usually someone is appointed to review complaints, if you feel you are up to that. I'm not sure but if you ask you could probably find out. This behavior has to stop and it seems from what you say that you can't do it alone.