Since you are still on the job, you might be able to create a post hoc paper trail by initiating written correspondence with your manager and also possibly HR, telling them how much you liked the job substantively but could not tolerate the demands that had nothing to do with the job function and that ran against your personality and mental health dx which is a recognized disability. You might tell them that post hoc you wish you had asked for a formal accommodation but thought that it was absurd to call an accommodation your desire to be left alone and to focus on the job for which you were hired and have been paid. Reiterate that you performed the job substantively very well, enjoyed it, and got no negative reviews, and would have gladly stayed on the job had it not been for unreasonable demands.

Writing this might elicit disclosure from the employer that would later bolster your case which now is lacking in written evidence. But the employer might also become tightlipped if they realize that you are collecting written evidence against them.

I would talk to an attorney about this right now. Ask for an urgent free consult, tell the attorney that you are still on the job and can still communicate with the employer, creating a paper trail. You will be uncomfortable doing all of that, talking to an attorney, communicating with the employer, but it is in your best interest to proceed. As you see, your unemployment benefits eligibility is at stake in addition to the possibility of a monetary recovery from the former employer.