Ok. Deep breath, we'll get through this.
First of all, your family are idiots. If something's wrong with you, big or small, they should be concerned about you, not condescending (Ooo, big word. I don't get to use those very often

). Even if it turns out not to be that seriously, they should at least care.
Second, your family are idiots. You don't 'work through' a back injury, you go to the hospital and get it checked out, then take things from there. And if that doesn't work, move on to my third point.
Third, your Doctor's an idiot. If you can, try finding a different one and explaining the situation. If not, tell your current Doctor that you're unhappy with the way your case is being handled and you'd like to know your options. If they really told you they don't know what's wrong with you, that's not exactly a vote of confidence!
Fourth, your family's an idiot. If you're injured, why would they expect you to do chores (as opposed to choirs, which I'm sure you'd be absolutely fine with, angelic voice that you probably have)? YOU'RE INJURED. Tell 'em to lay off.
Finally, you're an idiot. How the hell am I supposed to read your entire post in a Christopher Walken voice? He'd never say anything like...
oh, wait.
Never mind. I'm an idiot.
(As opposed to you, who's just angry and needs to vent. In a Christopher Walken voice. How do I end up in situations like this?)