You shouldn't have to be using your "vacation/personal time to cover some absences."
They're playing games with you, you'll need an attorney to fight for your rights.
It's up to you, alot of people can't afford to go "all in," in other words call their bluff.
Sure it's good to read up and find out your rights, but be advised, you're not a lawyer.
You need to consult with a local attorney who specializes in comp.
There's alot of ways to get your foot in the door, a good lawyer should be able to advise.
You have to stand up for yourself, don't let people push you around.
If you're in pain at work, notify your boss and ask to go back to the docs.
Or take your pain meds, go to work and notify them that you're under the influence and that you don't feel safe.
It's up to you...I say..... "KEEP UP THE FIGHT!!!!"
Moderator Responses are based on my personal bias, experience and research - They do not represent the views of the admin nor may be accepted in the legal community, always consult an attorney.