Is my dental office manager being fair about my sick days and hours?

My office manager pulled me into her office today to tell me that I call in sick too much. At my office, we don’t get any paid sick days, I am a newer graduate paying off my debt. Therefore, I do try to work as much as I can. I’m working in the healthcare field as a dental hygienist; I work in very close proximity to the public, and I’ve been getting uncontrollably sick frequently in my role. The sickness’ are to the point I’ve been hospitalized or bed ridden. My office manager told me she does not want to give me more hours as she doesn’t feel like finding me constant replacements. I can understand where she’s coming from with the inconvenience of it. But this conversation has made me feel like an extremely crappy employee, despite that I know I put in 110% effort. Again, I’ve just been so unfortunate to get extremely ill in this career — healthcare. The thing that doesn’t sit right with me is that she encourages employees to come in sick. She recommended I place cotton rolls in my nose to prevent it from running while working and basically to just suck it up when I get really sick. I went over my absences independently as she never shared exact numbers with me. But I was absent 11 days last year in 2025 total. But I would pick up extra shifts and cover for other employees when they were sick. This year, I unfortunately had an emergency appendix removal and my surgeon gave a drs note for 10 days off. Again, I pick up several shifts for my coworkers when they’re sick, or on holidays. It’s only the odd time too that my manager has not been able to find replacements for me when I call in. My question is, do you think my office manager is being fair? Unprofessional? Valid? I’ve just never had an employer discuss this with me before. I also am not sure what else I can do.. I can’t help being sick. Would you as a patient want your dental hygienist to work on your teeth, be in close proximity to you when they’re sick?

Is my dental office manager being fair about my sick days and hours?
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