Please help - I have been building a new prezi for 2 weeks. I went to add an image and more than 75% of my prezi is now missing.

Please help - I have been building a new prezi for 2 weeks. I went to add an image and more than 75% of my prezi is now missing. Can I get it back?
Here is my link http://prezi.com/hirqzutegfvp/edit/#18_87229034