The thing is, I think we are, as a culture, sort of in love with the broken leg model of illness, injury, and disability.
Here's what makes the Hollywood broken leg model so shiny.
With a broken leg, you:
*know what has happened.
*know when it happened AND
*know it right away.
*know what to do to fix it.
*know about how long it will take to heal.
*know that it will not suddenly get less healed for awhile in the middle and then jump back to more healed again.
*can easily predict which things will stress the injury.
*know that it will be completely fixed when treatment is done.
*have at least some theory of where the person experiencing it falls on the continuum of sinner ("What were you doing on top of that water tower at 3 a.m. anyway? You're lucky it wasn't your neck!") to saint ("Hit by a drunk driver while helping an elderly nun across the crosswalk? Let me fluff that pillow for you, you poor baby!").
*do not have any doubt as a casual passerby whether there is something wrong, or what.
Of course, not all of this is actually true of broken legs, even! (I have edited in a few spots to add "Hollywood," because I want it to be absolutely clear that I know that my friends' leg injuries to not come with these magical advantages.) It's just the assumption from people who don't have the said broken legs. But it is a mighty convenient set of traits for an illness, injury, or disability to have. And the farther from this model your actual illness, injury, or disability goes, the more frustration you are likely to face from other people, because their questions are likely to be centered around the broken leg model.
Why didn't you go in sooner? they will snap. Sometimes they don't even notice that they are snapping, and if you point out that they're snapping, you need to stop being defensive. But see: if you break your leg, there are bits of broken leg sticking out, and you are an idiot for not going right in, right now! But what if you wake up just exhausted one morning? Should you go to the doctor that morning? "How long have you been exhausted?" the doctor will say. "Since this morning," you say. Wrong answer. Get more sleep, or less sleep. Get more exercise, or less exercise. Eat differently. Change something up. What if you feel a little dizzy? If you're female, does this correlate with your menstrual cycle? Well, if you've only had it for one day, you can't really say, can you? Why didn't you go in sooner? Because some things are not a broken leg. And if you get a history of going in and mentioning things that have not really been a problem very long, if you're not very lucky, you get a doctor who writes down "hypochondriac" or "drug-seeking," and then when it's still a problem later, you've got that to deal with. The cardiac surgeon's memoir I read recently acted as though women could go in with fatigue and find out whether they'd had a heart attack every time they had fatigue, since fatigue is the main symptom of heart disease in women, and I laughed and laughed. It is not some feminine perversity that makes that not happen. Really, really not.
Why don't you take meds for that? they will ask. Because naturally there are meds for that in existence. And they work for you. And they don't interact badly with anything else you have to take. It's just spite that makes you not take them, or spite that makes you take them wrong so that they don't work perfectly. This is the twenty-first century! They can fix things! Who can? You know--They! They can! Them! They would have already if you had only gone in sooner! What these people mostly want is for you to have a big plaster cast on your kidney, your endocrine system, your ears, or whatever else is not working--in some cases your actual broken leg that was not perfectly fixed by divine fiat somehow, because the world does not magically work like that--so it can fix the thing, they can sign it, and then in a few weeks somebody can come along and saw the thing off and everybody can go skipping merrily along. Most of us want this too. It just doesn't happen to work that way.
I'm pretty sure I do this to people, because one thing I've learned in the last few years is that we are all really terrible at spotting the ins and outs of illnesses, injuries, and disabilities not our own, so one of my new self-checks before I open my mouth is going to be, "Am I trying to treat this like a Hollywood movie of a broken leg again?" Too many of the formal things we have set up for employment and compensation are working on the broken leg assumption. The least we can do is not perpetuate them when we have the option.