At a church gathering the event had to be outside due to states protocols. My daughter has to wear a face mask due to the rules of wearing one. She started breathing heavily and complained of a stomachache. I had to run her to a nearby restroom and she vomited. The event did not take a long time and when we left she took off the mask immediately. After removing the mask she was perfectly fine. I know without a doubt it was the mask making her feel ill without being able to breath.
Imperial Valley, CA