Boss said I can’t call in sick?

I work at a grocery store. I’ve only been here a few months, but I have never missed a day. I’ve been liking it as far as these types of things go.

I worked yesterday morning, and I had a cold. Yesterday night, my symptoms got much worse, fever, chills, diarrhea, you name it. This morning I woke up just as sick.

I called in requesting off, and asked for my manager. Instead, I was directed to a different person who told me I couldn’t call off sick, that no one would fill for me, and that I should just come in because it’s a short shift and it’s, in their words, “doable.”

I was dumbfounded and just said “okay” to everything until he hung up. I tried reaching out to a different manager and have received no response. This shift is approaching and I am not feeling better at all. Is this normal? What am I supposed to do?