Is it safe to live there? If the sinkhole has not been repaired you may want to move asap.
If you have a hardship you may be able to do a short sale and get out from under the liability for the mortgage. I can offer to do short sale at no cost to you and you also may be able to get up to $3,000 for relocation expenses under the Making Home Affordable/HAFA II program.
Let me know if I can help.
All the best,
Alma Rose Kee, PA
Future Home Realty