My kid is always sick

I feel like my 2 year old is always sick. Ever since she started daycare in September she’s literally been sick every week. She’s had a cough that never fully goes away, she will start to get better than bang she’s hit with another cold. When we go pick her up you can tell there are a lot of sick kids there so that’s definitely where she’s picking it up. But it’s mentally and physically exhausting. I suffer from anxiety so whenever she is sick which is all the time my anxiety is through the roof. She’s been to the doctor many times and we’re always told it’s just viral and needs to work it’s course. We’ve also been told it’s normal for kids starting daycare to be sick a lot during the first year but I still hate this. I’m constantly worried.