This situation is going to be problematic.
You can get a new automatic stay effective for up to 30 days (longer if you file a motion within that time period and the court approves it) if you file a Chapter 13 after your Chapter 7 case has been dismissed.
If the stay relief hasn't been granted yet or the hearing hasn't been hear, try to have your attorney argue for a 45 day order to allow you to cure the mortgage arrearage. I have had judges grant these very commonly.
There is a 10 day automatic stay on stay relief orders. This gives you the time to appeal the order and get a stay while the appeal is pending.
Once the stay has been terminated with regard to a creditor, it is almost never reinstated.
The best option in this type of issue would be to have your attorney discuss the matter with the creditor. Let them know that you will able to cure the default within a certain time period and see if they will stipulate to postpone the foreclosure for that time period. With the market like it is, creditors are wary of foreclosing, you might have a shot.
If not, discuss with your attorney whether it would make sense to pay another filing fee and file a chapter 13 so you can get another 30 days automatic stay.
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DISCLAIMER - This answer is not legal advice. No attorney-client relationship is formed. The information provided is for educational purposes only. For specific advice regarding your situation, please consult a qualified attorney in your area.