I have been in the lab for more than a year and my mental health has been damaged seriously due to the harassment of my PI, and I believe my PI has breached my confidentiality by sharing information I told in confidence with other group members and the administration.
I have thought about going elsewhere to continue my PhD. However, I realized my academic progress has been delayed due to the mental health problem and I would need time to recover. I am afraid of jumping into another lab. Also, I do not find any other professors in my department whose research interests me, perhaps because my mind is currently occupied with all the negative experience with my PI and that clouds my thinking?
I want to change university and start totally fresh but obviously I would not get a good LOR from my PI.
I want a career in academia but I really need sometimes to recover. How should I proceed?
(Edit: adding update posted as answer) Thank you very much for all the suggestions. I avoid talking all the problems with my family since they are not in academia and I do not want them to worry about me. Writing all my thoughts here helps me to release everything I've tried to keep inside myself. I think my mental health seems to not as serious as I thought because after reading all the comment, I feel more positively now.