Timeline disappears on saved project

I saved as, saved my project and manually saved as i went to ensure my project was saved. When i went to lunch I closed the project. I repopned it using the saved file and the timeline was blank. Media was saved into the media bin but the timeline sequence was blank and i lost all of my work. This ha snow happened twice - me thinking the first time was a me error. 

I have checked through autosaves and checked the media bin, it was gone. I have spoken with an agent and tried to find it, it is gone. The saved file does technically exist but the timeline just dissapeared. Ive tried a third test as advised my the agent, and it has done it again. The file saves, but the media within the timeline sequence is gone.