Please don't work for free. Call in sick if your company won't approve PTO. Also take a few sick days because stress is not good for your health, don't waste your vacation time on recovering from stress. My company officially consider "Mental Health" as one of the reason for calling in sick.
And definitely don't quit without finding the next job. You will be under a lot more stress and it would affect your performance.
And definitely don't quit without finding the next job. You will be under a lot more stress and it would affect your performance.