Yes I think you are obsessed. Is that a bad thing? No, I don't think so. Its what us humans do... The thing is though that the part of your obsession that says that she is yours; "how could she possibly..." or "how could this other person think that they could be near her like I am" is what needs to be addressed. She is her own person and you yours. She is not yours to keep close. You can have close moments when you are together and even over text, but she is capable and going to have them with others too. Just as you can and have.
I also suggest you concentrate on yourself and your other relationships of every kind. Its important, I think, to keep a balance of all things in life and it sounds like your balance needs a bit of re-balancing.
If I were in your situation I think I would call her up in a good moment and wish her well with her guest and tell her you will see her when you get back. Then I think I would text her every day, say hi, put lots of smileys on there and say what you are doing and wait it out until you get home and then some. I think I would go home and concentrate on what I have been neglecting as a result of the NRE of having this woman in your life and try not to obsess about her. Then I would see her for coffee, a meal, whatever and ask her how her time went and catch up... see how you feel and ease back in or pull away accordingly... if you feel like you want to ease back in I think I would then tell her what went on for you and how you feel about her and see how that goes.
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