Missing Love (need help!)

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Hi all, It's been a while that I came here but I came back because I need a lot of help. I do not know what to do anymore. I have an internet relationship with a girl that I've known for 8 years. We were together for 2 years long and everything went very well. We never exchanged phone numbers because of the costs (I live in Europe, she lives in USA). She originaly lives in NY, but had to move near Chicago for her university. After a year she got asked by a different university near Tampa if she could be on that one. She really wanted to and she was going to catch her flight on a Friday. That was May 22th, this year. She sent me a message and said she had to catch her flight but didn't feel good at all. She felt kinda dizzy like but I thought it would be the nerves for her new university. That's the last day I've hear from her. That's 4 months right now. There's a lot of things spinning in my head. I don't know if she's sick, alive, or just busy. I only know her email address to contact her but she never sent me a message after that day. I do know however her full real name. I don't know her real address where she lives or whatever. So my question to you is, what should I do? What can I do? It's been 4 months now and I can barely fall asleep. I've been depressed before and she is the one who got me out of it in no-time but I am about to fall in that hole again. Honestly I don't really mind that she's away for a long time, but I'd only love a message so I know she's alright. What can I do? Thanks for your time.