I'll tell you what is covered... the FAA. They take a dim view of employers pressuring pilots to fly while sick. If you feel you've been subject to such pressure, after a discussion with your reps and CP, make a call to the FAA and keep them abreast of your situation. If something happens while you are flying sick, it will be to your extreme benefit if you've been in contact with the fuzz. Otherwise it's all on you.