Feeling ill during workout?

Yesterday I want to a Muy Thai class (mma) and I barely made it to the 30 minute mark. It’s a pretty intense class and I’m always out of breath however yesterday I felt seriously ill. I could barely breath, my vision went blurry, I couldnt stay standing and I had to leave halfway through the class. I’m not new to it nor was I feeling ill before hand. I don’t know what happened and I really want it to not happen again. Any advice? I do have exercised induced asthma but took my inhaler and I ate ten minutes before I went to class. I don’t know what else could’ve caused it

Feeling ill during workout?
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