The comedienne fainted on stage during a show in Arizona Saturday night.
McDonald shared updates in the emergency room to her Instagram followers via Instagram Stories.
“I passed out onstage.

Heather McDonald updates her Instagram followers from the emergency room after fainting on stage during a standup show.Heather McDonald/Instagram
I got up, I did one joke and I felt so dizzy,” she said.
“I cannot believe this happened,” she later added.
“I feel so terrible that they had to tell everyone to leave and then cancel the second show.
Tempe, I will be back.
I’ve never ever fainted in my life.”
McDonald later told the outlet she declined an ambulance and had her sister-in-law drive her to the hospital.
EW reached out to McDonald’s rep for further comment.