Purchased home 2 yrs ago, appraised now 10,000 less then what i finance? what can I do now. need to re-fin!?

I believe the seller paid someone off to get this home to sell. I took an ARM loan 2 years ago, and now that I am trying to refin, found out that there is no way my home was ever worth the value that I paid. Is there some type of Real Estate law to protect me here. The broker i used is bankrupt too, so I can go back to them to see who appraised the home back then. It was a for sale by owner deal too? PLEASE HELP - ARM LOAN CLICKED OVER AND I DON'T WANT TO LOOSE MY HOME DUE TO THEIR LIES WHEN I BOUGHT IT.