Ryan, the amount they've been touring here, in Europe and in the US in the last year is probably *why* they've had to cancel a few gigs due to ill-health. It must be damn knackering travelling and performing as much as they did :(
Money is automatically going to be put back into accounts of ticket buyers. If you bought them from someone else through seatwave/ebay etc. then you might be in a spot of bother. Pretty shitty not to rescehedule it, though.
This is the absolute worst. Been looking forward to this for months, don't get why he was taken ill last night but it's taken O2 Academy until 3hrs before doors open (with a huge queue already) to announce the cancellation. Gutted. Hope he gets better soon though.