Am I allowed to carry an inhaler with me at school?

I was sitting in class when someone sprayed A LOT of perfume and my asthma started acting up and I had trouble breathing. I asked my teacher if I could go to the nurse and she said,."no because it's the first 15 minutes of class." So, I just sat there suffocating." And someone said, "she has asthma." And she wrote me a pass to go. I just want to know if I can carry an inhaler so I don't have to go through that whole awkward situation again.
Am I allowed to carry an inhaler with me at school?
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