Bro. You have to go to US Embassy in Maharajgunj. Thursday morning is the only day for Greencard holder issue. Basically you have to explain what happened. You will fill out all the papers. And then they will interview you. Ali gaali sunnu paryo. In my case, I had to wait for their call. Make sure to give them your cell number. If you dont get a call after a week, check with them again on Thursday morning. I got one month visa to get back.