If you can't pay what you already owe, you cannot afford to move out either.
Stay at home living rent-free and work one full-time and one part-time job.
Yes, you should be freaked out. No, you don't take on more bills until you've got a grip on the ones you ALREADY HAVE.
Reduce your expenses and increase your income. Period.
The bottom line is you can be sued for outstanding debts including medical bills. Depending on your state, they have a variety of collection options including possible garnishment of any wages you are being paid.
Contact them and make payment arrangements.
haven't you been on any health insurance?
declare bankruptcy