My has falling off, Advice?

So i awoke up this mornin and saw my was missied i was a concern lots at first but then found it in the garden pond i duno how it got ther bu i cant get it bakm on plz i tryed glue an everythin an sellotape! this has neva happend two me befor but i kno is a common problem i dunoo wat two do shud i go too the doctor! i told my mom but she jus said i might to go live with my aunt and uncle in Bel Air.