The same happened me earlier today. I went for dinner and when I came back I had lost my character. Seems to be no way of getting him back. I had just reached level 13 too, this is very frustrating. Are the developers aware of this and is something being done?
Edit: Just read that I can continue playing with my character if I connect to the same server! Going to try that now.
...you mean... you thought you Character traveled with your whenever you change servers.... BAHAHAHAHAHAAHAHA..Can I take my bump back?