sorry mate to hear that , Ya ! Same problem happened to my fren too . He lost his passport and now he is stuck here . You can go to Nepal , but if you want to come back ,  you have to reply for visa again. ( same all process , interview , documentation ) or there is one option you can take risk by going canada or mexico and apply from there . but there is risk !.

you can apply for new passport at the moment or you might wait for readable passport which may help you , coz it gonna replace our old passport .

suggestion according to my frn who lost his passport too ,  stay cool here , or take your own risk !!there is no any other way that you will get visa without interview again . and for interview you have to go back to nepal and re-apply again.