Walked away from my home last year - no foreclosure - now wh

On the advice of my bankruptcy atty (in Michigan), I sent my keys and a registered letter to Bank of America about a year ago. I have spoken to reps at BofA many times since. Now BofA is saying I have to hire a realtor and arrange a short-sale. I called the attorney, who first said "nonsense", then said well, maybe I could be held responsible for this and a host of other things like "vacant home" insurance, damage to the home, etc. I get $1500/ mo in Social Security, which barely covers my expenses, and I'm terrified! Is this true? Is the attorney at fault? Where do I turn now?.