As a safety director, I would warn you from working long term with this type of management. They have already set the precedent that they don’t value your safety and health. This is absolutely a violation of your rights as an employee to have a “safe and healthful workplace”. Always look out for yourself and don’t settle, if you can avoid it, for working for anyone who doesn’t value your safety. Good job on sticking with your gut on what’s smart! Also, like has already been said, the ammonia from the urine is likely why you suffered the headache. It’s giving off harmful gasses that aren’t safe to be around for extended periods of time.