Well hopefully if it's fully frozen and you aren't opening the freezer some of it may still be fine. Things like meat with high thermal capacitance can stay cold fairly long on their own if the freezer is appropriately insulated. Best of luck.

Why is the food at risk? With how cold it is outside your house should be colder than the fridge soon.

Sarcasm... Kinda

Not exactly. Our young are useless and need protection/support. If we die trying to raise them they die too, and the resources spent to get us to breeding age were wasted.

Yes, but do those other methods of diagnosis allow House to look like a magician who pulls diagnoses from thin air?

Both in universe and for the show it makes sense for House to go with the most dramatic option because a large part of his personality is wanting people to see him as a genius.