The minimum, if it isn't covering the full interest charge is being added to the principal and there will come a point where the lender will no longer accept a minimum payment.
If you don't have a CPA then contact the California Credit Counseling Service of SF they can give you options better than anyy Realtor.
All we can do is sell the property for you and work with the bank to get them to accept the price. If you can hold on to it hold it. The value will return. If you are going to hold it try to get a stable loan.
My crystal ball is a little foggy, but I don't feel I'm going out on a limb to say that home values won't be increasing by 30% over the next year or two.
If you can afford it, keep it. All the economic forecasts I have been to recently predict a change coming soon. I hope you are not distressed and like living where you are. This is a down time but things will change. I wish you all the best.