The 'Rocket Man' singer spent two nights in intensive care after becoming "violently ill".
WATCH: Janet Jackson has released a 43-second clip of new material, saying 'you're important' to her fans.
The excerpt, which can be viewed below, comes with the hashtag #ConversationsInACafe and the title: 'I wanna tell you how important you are to me. Love J.'
Over the top of a notebook with scribbled writing on it, she sings:
"And never for a single moment did I go without your love. You made me feel wanted. I want to tell you how important you are to me."
This clip comes ahead of the 49-year-old's new album Unbreakable, scheduled for release soon. Jackson, 49, will support the record with a world tour.
Watch the clip here: