photos library disappeared

My photos library disappeared so it said something about new library so I clicked on it and it was doing something to I guess repair it....well when done it acted like I never had a photos library and said I could go through the tutorial....I didn't do that and went to check my photos and literally half of them were completely gone! I don't know what happened to my main library or how to get it back......is there a way to do that with my time machine.....???