Can fillings come out I have 3 fillings 2 white one silver and one of thewhite looks like its not there anymore?

Yes. Dental fillings, whether they are amalgam (silver) or composite (white) can definitely come out of a tooth. There are a a number of things that can cause the filling to come out. If a filling is missing from your tooth, you should see your dentist ASAP to evaluate the tooth and have the appropriate treatment performed.
Sure. Restorations can dislodge. Please see a dentist to have the tooth evaluated and restored.
Yes. Fillings can break, wear out, and/or become displaced. Call your Dentist to have it checked and, if required, replaced.