I apologize if I'm repeating someone - I've been away, and haven't waded through all these replies yet, but still want to put in my two cents...
Ross, when you're nearing the end of your rope, it's food first. Then rent/mortgage. (Okay, for you - Oxygen first, then food...)
Then electic/phone.
The hospital bills are not number one. (Sounds like they're giving you a lot of number two, anyway.) They're like number seven. Remember, those office managers will sleep just fine anyway, even if you have no place to sleep at all. Nor will they skip any meals because you are hungry.
They cannot continually harrass you. It is against the law. They should realize that if you can't pay immediately, their best chance is to discuss a payment plan that you can go for over time. Hold off on the hospital bills until you're sure you're getting by for the month - then send only a token payment. They'll deal with you. If you lose everything, they get nothing. It works best for them for you to have a stable situation.
If you're actually, absolutely positive you're going bankrupt, do it before President Bush's new bankruptcy law goes into effect, where you get all the restrictions of bankruptcy, but still keep - and pay - all your bills anyway (what good is that..?). Interestingly, medical bills were precisely the reason the bankruptcy laws used to be so lenient in this country, to give people a second chance. The new, tougher laws are aimed at credit card abusers, but I don't know that they make any distinction between them and unsinsured medical bill victims.
And don't worry about it between payments. If you have no money, there is nothing your pain and worry will help in the situation, nor prove to anyone. The truth is, to the office managers, it's just a job, and you're just one person among many they want to collect funds from. It's not even the least bit personal. They don't go home and talk about you, think bad thoughts about you, or even think about you at all, so don't even consider that they have any opinion about you at all - they don't.
Oxygen. Food. Rent.
Best wishes,