It's the Confused Oracle hitting us with a wall of text.
Panel 1: Iris explains to Phil that a sedated Jim who's wearing an oxygen mask has been fairly healthy since last October. She goes on to say that she thought he'd have Stroke Number Three but instead had Coronary Number Two.
Panel 2: Phil pleads with Iris to let him keep her company. After all, it ain't like Liz is gonna notice he's not here. She refuses to his offer. She'll be fine and she wants to be the first (and only) face he sees when he wakes up.
Panel 3: Tempting fate just as much as Liz did, she then says he'll recover from this and that the doctors are doing everything they can to make him better despite there being no doctors in sight.
Panel 4: She then tells him not to worry. Just have a great time at the wedding and act like nothing's wrong. Judging from the look on his face, that's not gonna happen.
Summary: Oh, that wacky Iris! Commanding people to do things that no decent human being should! As howtheduck said, she's just become the most important person in the strip because she just gave these people a choice between a dying man or an ugly wedding. Will they be human or Foobs? We shall have to see.