My best friend is in Turkey for the summer?

What do I do. I am in like so much depression. She's leaving the 4th of July (2 days) and I have hung out with her EVERY day for the past 2 weeks. She's the person I went to my first party with, went to concerts with, shared secrets, made youtube videos which got successful, had our youtube account hacked, wrote songs together, got me better with guys, she gets invited to all the parties and because of her I get to tag along and so much more. I help her in schoolwork, she helps me socially. This summer is going to be terrible without her. To make matters worse, she comes back the SECOND day school starts. :3 I am going to cry. What should I do? Should I make her something? IS THERE ANYWAY TO CANCEL FLIGHTS? :P