Livid with my job!!!

There are many reasons why I am livid with my job. One being that I constantly get texts from my supervisor asking me to work on my days off, our department which is supposed to have 12 eployees only has 6 people including me, one of which is out on medical leave, I am only a part time worker but am scheduled 5 days a week when at most I wanted to be scheduled 4 days, for religious reasons I do not work Sundays but yet I'm being asked to come work on Sundays left and right, I constantly feel over worked and come home exhausted everyday. Saturday I left work early sick and had to call off Monday and Tuesday and today, my scheduled day off which I have plans to go grocery shopping before my coupons expire today, still sick as a dog, have been asked to come in and close. I work in a deli so my job is handling food, I am not to come into work sick due to that fact but yet I'm being asked to. I don't know what to do anymore. My job literally makes me have panic attacks and sends my anxiety through the roof. I love the people in my department which is why I haven't left and I get free memberships since its a wholesale club which comes in handy and its the highest paying job I've had in my 3+ years of working. I just don't know what to do and I'm at my wits end. I mean in this situation what would you do?