Creditors have different options available to them to collect debts once they get a judgement in their favor. They can lien property, garnish bank accounts etc., it depends on applicable laws, the type of debt, the amount of money owed and other factors. As far as what they can do to you personally; it sounds like you're fairly "judgement proof". You don't have any assets they can seize. They can't take your clothes or lap tops. Most likely it sounds like they will end up getting a Judgement, and if you don't pay, they will petition the Court for some type of payment plan.
Do you have the lawyers information that represents the hospital? Contact them and ask to speak to the Attorney about any possible options of settlement prior to the hearing. You might be able to negotiate a settlement or a payment plan. Will your Uncle loan you small monthly payments? That might be an option. It depends on whether or not they are willing to negotiate.
You may be "judgement proof" right now, but in the future things could change. This could affect future purchases of a home, getting a mortgage etc., and it will also stay in your credit report. You really need to gain employment or if your not able to work, apply for help.
Not knowing what services were rendered is questionable at this time. It has been five years. They must have made an attempt to collect this debt from you prior to seeking a judgement? Did you ignore their contact? You are responsible to make sure you are receiving or having your mail forwarded to where you currently live. Saying you don't know what services were provided is not going to fly or get you off the hook. You have had ample time to contact the collections agency, the hospital and the Attorney who represents the hospital. They can tell you what services were rendered.
Let this serve as a very important lesson to you, and I'm not being mean at all. You sound young. Don't make the mistake of ignoring debts and think they're going to go away. They are notorious for coming back to bite you in the rear end when you least expect it. It appears creditors are becoming even more aggressive nowadays in their attempts to collect as well. Bad debts effect everyone, not just the debtor. Creditors recoup their losses in the form of passing on higher interest rates, higher fees for service.
Does your community have a program to help low-income people with medical debt other than Medicaid? We have one locally here in NH. I had a friend served with a $40,000 lawsuit from the local hospital, and we were able to settle it for him by enrollment in the program and a small payment plan. Have you tried calling your local DHHS, welfare office or the hospitals billing department to see if they have one?