https://www.usmagazine.com/celebrity-news/news/roseanne-barr-denies-heart-attack-rumors-says-she-was-pranked/

"I'm fine," she tweeted, adding in a second tweet: "I’ve had no medical issues. I’m spending time at home with my family and relaxing."

It was probably just gas - they've used that scenario on several sitcoms in the past