How to get my girlfriend back?

Hey, so my now ex girlfriend and I had been dating for 10 months throughout our whole senior year and now it is june and she just broke up with me friday night. She told me that she isn't sure what we would do in college because she would want to be with me if we were dating and when she did it I didn't really tell her how I truly felt. That night, I could not fall asleep and I stayed up all night thinking about what to do. The next morning she left to go on a cruise for a week with her family. I emailed her when she was on her way down there and told her the truth about how much I love her and that I want us to try a long distance relationship. She told me that she didn't think the long distance thing would work but she didn't seem to be totally against it. Then she said that we should just not talk for the week she is on the cruise and see what happens from there. Its been two days since she broke up with me and she has been on my mind 24/7 even with me trying to create distractions. I haven't felt hungry since and its hard for me to sleep. When she gets back, I will be at orientation for college and when I get back she will be at hers. The day she gets back, she is going on a week long camp with our church. I think Please tell me what I should do to get her back and nothing about letting her go, because I will not give up. I love her. I think a LDR could work if we skype, text, and call each other. The longest wed ever be apart physically would be maybe 3 months. She means the world to me and im not ready to let go.