But really, why do you think flu is so deadly? If you are very young, very old, or have other medical conditions, fine, it makes sense to hit the ER. If you are a healthy adult and just got hit with a bad one/two day flu, you are able to keep your fluids in (beyond sweating them out), you don't need to hit the ER even if you feel like crap... By delirious, I'm talking about shady gradients anyways, I've never had more than sweating dreams where nothing makes sense. Ya, there is a point where you should go the ER, but our thresholds are fairly diverse.