Hi Sipora,
I'm really sorry to hear what you've experienced. I understand it can be depressing since I went though something similar recently.
Anyway, the first thing that I would suggest to do is to contact btc-e and ask them on how it was done (which authentication was used and any changes in the email address)
And don't forget to change your password for the btc-e account and email, since your password might have been comprimised.
Virtual currency is something that's very hard to track, since it's the main purpose of the currency in the first place. But you can track someone who login into your account, by checking it in with the btc e website.
Hope you get to see some light from contacting btc e.
Best wishes,
Lukas