You cannot file Chapter 7 within 8 years from the date of filing of a prior case that received discharge. So, if you filed 4 years ago and got a discharge, then you cannot file Chapter 7 for around 4 more years.
However, you can file Chapter 13 anytime after a prior case, but it is generally good to wait 4 years after the prior case to be sure you can get a discharge, and not just an automatic stay, in your new case. Since you said it was 4 years ago when you filed your earlier bankruptcy case, you should be pretty close to being able to file a Chapter 13 which can get a discharge.
Chapter 13 requires you to pay as much as you can to the court in monthly payments for 3 to 5 years, and at the end of the 3 to 5 years, your case is over and you get a Discharge. You don't have to pay everything you owe over 3 to 5 years, just as much as you can afford over that time, and whatever does not get paid is discharged.
This may be a great option for you so you can get instant relief from the $18,000 in bills plus let you surrender the house and car and discharge those liabilities as well. You may also be able to restructure your car loan so you can keep it. Speaking to your lawyer may give you other options as well, since Chapter 13 is generally very flexible in helping you restructure your debts.
I hope this helps and a positive feedback is always appreciated if this was useful to you.
LEGAL NOTICE: I am only licensed to practice law in certain state(s) and I cannot give legal advice to someone who does not reside in a state in which I am licensed, nor shall anything I say in the above answer or elsewhere on this site be deemed legal advice, even to someone who resides in a state in which I am licensed. Fees I receive for answering questions are paid for information, not for legal advice. This forum is designed to provide general information only, and information herein is not warranted to be correct or applicable in any way since laws may have been misinterpreted herein, since laws change from time to time, and since the impact of those laws on any particular situation varies. The information presented in this site shall not be construed to be formal legal advice nor the formation of an attorney-client relationship. Persons accessing this response are encouraged to seek independent legal counsel in their jurisdiction for guidance regarding their individual circumstances. Do not take any action or inaction based on information presented herein since it is informational and may not be accurate or applicable to you; it merely attempts to give you a basis of knowledge to help you formulate questions to ask a legal or other professional in a face-to-face meeting in your jurisdiction. Joseph Ross does not hold himself out to be a specialist or expert in any area, regardless of assertions made by any third party, and any implication of being an expert or specialist herein is made in error. I hope the information presented above is useful to you. Answer above is (c) Joseph Ross. All rights reserved.