My silver crown came off along with my tooth but its still in my mouth hanging off to one side, what can I do?

You'll need to explain some more. Usually a silver crown is placed on a baby tooth. When the baby tooth is ready to fall out, the crown comes off with the tooth inside. That's normal. If you had a silver crown placed on a permanent tooth and that has come off, you need to go see a dentist as soon as you can. 

Hi, You should go see your dentist immediately to see if they can still save the tooth and what the underlying issue is.