There's 3 different types of patients being discussed here. The "Honugirl" type, I happen to like

both because they DO make it easier (I'd rather hear that I'm putting a lab in the wrong color tube than have to go back and redraw it later - and I'm sure the patient would too!) and because they do know themselves and their bodies. I have seen co-workers get upset thinking they were "telling me how to do my job" when that's not it at all. People like this really DO know!
Then there's the pure and simple noncompliant type. The ones sneaking food when they shouldn't eat anything, the diabetics who never check their blood sugar, and the ones smoking while on oxygen. Yikes. These people are just frustrating, because you know no matter HOW well you take care of them, no matter how long you spend trying to explain what they need to do and why - in a way they can understand, they are going to go off and do whatever the heck they want and slowly kill themselves, and it's hard to watch. It makes you wonder why you bother.
Them there are the types I believe were mentioned in the OP. The ones who come into the ER with non-specific symptoms and demand you help them, but they don't want to be examined, they don't want any tests, but yet someone is supposed to magically figure out what's wrong with them.

These are the ones that we think to ourselves "WHY ARE YOU HERE?????" Maybe they're afraid of the diagnosis, or the bill, or who knows what, but if they won't allow any treatment, then why do they bother coming in at all?
Get some sleep, monkey!