Any chance you could get to some counseling appointments and review this situation there? Maybe discuss your work situation in detail and look for creative ways to move through this. It would also give you a forum to discuss your feelings, especially your anger, about the work changes and expectations. Ultimately you may find this work situation is not right for you but it would be best to come to that conclusion after careful consideration.

Work is such a part of our well-being and happiness that I hope you take the time to work through this in a healthy way. You have been a good employee. Take care of yourself and your career.