You Gotta Believe Me!(One Direction sick fic)

Niall Horan, the little Irish leprechaun of One Direction, is sick. Really sick. The only problem aside from that: the four boys don't believe him. They think he is faking it to get out of their busy day's plans. But what's going to happen when he goes out alone after a fight? Will his band mates get worried? Or will they just assume that he is fine and needs his space? And what will they do when they find out something bad happened to their friend and that he won't be coming home for a long time? How will they react to the stress, as well as management, their tour, their fans, their guilt? And most of all, how will Niall act towards the boys when he sees them? Will he forgive them? Or will he be so upset that he shuts them out completely?