Never bend backward for jobs or people that have no care for your well-being. Company’s and managers fail to realize that those demands are what causes their companies to be revolving doors of employees. Nobody wants to feel anxiety that they’ll be harassed over being sick or needing the day off for whatever reason. They’ll try to push you, push back, don’t settle for less than mutual respect. You’ll only be burnt out by trying to function like a robot for jobs that can’t even pay the bills at the end of the month, or for people who wouldn’t bat an eye if you were gravely sick or died, except for the fact that “we’re down an employee”. Also, I’d tell your manager that good policy is making sure when you change policies that employees are at lest verbally told they need to check their emails for policy updates. You know the saying, assuming makes an ass out of you and me.