in order to give a little advice, you need to give a little info. You should also find out if and exactly how much you are upside down. Let’s start with some easy questions.
When did you buy?
How much did you put down?
What is your monthly payment and the current rent from the house you aren’t living in?
What is the payment of the one you are living in?
Include total payment (principal, taxes, hoa, mello, etc.)
Selling short may be better option or trying the new fha rework thing that is coming soon. Don’t just walk away because you are pretty sure, be damn sure.