Take Jim Walker's advise on the other post and get an experience Realtor to work for you as soon as possible.
As you are dealing with potential short sale (you can't refinance your home and mortgage is set to go up), you want to start giving your Realtor permission to talk to your lenders and start the sale process. As you know, there is limited time at hand and the market is slow around this time.
You need to educate yourself about market and the short sale process, talk to your accountant about the tax and other consequences, and get it going. Some lenders have a criteria about how long the house has to be on the market before a short sale is permitted. They don't make it easy. Price and market it aggressively. Time is of essence here.