Have you missed work because of morning sickness?

My morning sickness has gotten much worse over the last week. All day nausea, but no puking. I've been tempted to leave work sick but am worried if I do it once, I'll never work again. 
I teach yoga, mostly in 90+ degree heat. This morning I taught two classes back to back and felt horrible the whole time. I had to lay down for an hour after the second class, and still have another one left today. I so badly want to just go home, but I feel like I shouldn't let the morning sickness rule my life. :(
How have you guys been handling it?

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