You have three sets of laws that govern your employment: federal employment law, NV state employment law and CA state employment law. Under federal employment law, and here we are primarily discussing the Fair Labor Standards Act, your employer is required to pay you minimum wage and overtime as necessary (which you state is occurring) but your employer is free to schedule you as many hours as it wants. The FLSA protects no rights to break, rest, or meal time.
Depending upon the state where you are performing work at a particular time will govern whether CA or NV's employment laws will govern what rights you have at work. My very limited understanding of CA employment law is that it favors the employee far more than federal law and the laws of most states. While you are working in CA you are protected under its laws, which may offer a more generous overtime calculation and/or obligate your employer to provide more break time or rest periods off work than what you are receiving.
Whether you can receive compensation for any employment law violations would depend on what violations are occurring. Wage-based claims are usually recoverable to the employee (along with attorney fees) but other violations may not. If you believe you may have claims then you need to speak to an employment lawyer where you are working.