Hello and welcome to JustAnswer.
I'm sorry to hear about your situation and hope I can help.
Unfortunately, unless your manager's treatment of you is due to discrimination based on a protected characteristic (such as race, gender, national origin, or ethnicity), the manager's treatment of you, while unethical and wrong, is legal.
However, you most likely would be able to obtain unemployment benefits if you were to quit your job due to the stress that you're enduring as a result of your manager's treatment of you.
You likely would have 'good cause' to leave your employment, which would entitle you to unemployment benefits.
You can read more about establishing 'good cause' for a voluntary quit online here:http://edd.ca.gov/UIBDG/Voluntary_Quit_VQ_5.htm
However, I would reccomend that you first make a complaint to your manager or HR, as it would help you establish your case that you left employment for 'good cause.'