I am in the same boat as you are. And what sakuntala sharma wrote is absolutely true as well. It is not guaranteed that your visa will be renewed in Canada or Mexico. In case you try via Canada and you get rejected you cant come back to US and you need to leave Canada within 5 days of Visa denial. So, I suggest try from Nepal itself. Even you are denied once you will have a home to live and enough time to reapply. This is what my Int'd advisor told me. Good luck.

Sparrow