There are few things you could do but rarely would you end up with instant equity in a short sale purchase. There is a slight discount for the risk that is being assumed by the buyer but they sell for close to their market value.
You could rent your house and then be able to move forward. Most mortgage companies consider the obligation satisfied if the rent is 110% of the mortgage payment. That's just one thought - please give me a call if you want to hash out some ideas.