I see many people regarding their day off or taking it explaining what they will do on their free time, nature of their sickness etc or answering phones during time off.
Remember:
1) its none of employer business what you do on vacation. Submit it, tell them its none of their business where you will be and enjoy free time. Turn off work phone or dont accept work related phones and emails.
2) employee have no right to ask you about the nature of your sickness. Its only your courtesy to tell them. If they try to guilt trip you into coming then fugg them. Send them doctors not and refuse to discuss the topic further no many insults and threats get thrown your way
3) NEVER answer work related numbers on your time off. If they want to have access to you after work, they should make you “on-call” and pay you accordingly
And last, but not least: its MANAGER’s job to find replacement for you. Staffing is literally their job. If you wont arrive to work, simply announce it, dont try to find someone.
If they retaliate, get in touch with your local union or atleast DOL. If youre not unionized, i strongly recommend you doing so. If there are no unions, try searching what it takes into founding one (protip: its usually profitable to get under wings of larger union )
Know your rights!