I lost my green card!! Or it may have been stolen. I don't know. I can't find it. What do you do? I need it back? I am desperate! Please help anyone.....

You can apply for a new one. You just need to know what to do. If you have misplaced it or lost it, then state that in your application. If it is stolen, you should get a police report that also must be included with your application. The fees are high now, but you must get a new one in order to proof your legal status in the U.S.