You should send an e-mail to the boss documenting the explosive and verbally abusive conduct toward you. You should ask the boss to please refrain from such conduct. If the boss fires you for complaining then you should be able to receive your UIB. If the boss doesn't fire you, but continues to verbally abuse you, send an e-mail to his boss. If the conduct doesn't stop and you have to resign due to the stress then you will have documentation to show to the claims examiner to support your case for benefits.
However, on a resignation the burden of proof is on the employee to show that based on a reasonable person standard that the abuse was such that a reasonable person would not be expected to continue in the employment.