I'm in a biology PhD program, and I'm three years into the process. However, my mentor is small minded, unsupportive, and borderline emotionally abusive. I found this out almost a year into my project after TAing his class for him, where he treated the other TA with a lot of deference and respect but was really aggressive and unkind towards me. When I spoke with him about realizing that microbiology wasn't my passion, he told me that I should switch labs because this really wasn't the place for me. At the end of that discussion he said I shouldn't hold him to the mean things he'd said (which is exactly the kind of emotional abuse I'm talking about).
For a long time I've considered switching from wet lab benchwork to computational biology, but am worried that the problem lies within me, and not with the work. Now that I've realized that my mentor isn't going to be of any help, I'm turning towards the internet hivemind. In short, my questions are:
A) What criteria have people used to decide to switch the scope and focus of their PhD projects when faced with an emotionally abusive mentor who has led to the emotional breakdown of at least two, if not more, of his students?
B) what is a good way I can assess if computational work is something I would like/be good at?
This also isn't something I can easily go to the department with, because the last time I tried to speak with someone they launched an investigation into the lab and so it ended up making my experience much, much harder.