I'm feeling detached right now actually :/ With a headache -_- It *****
So, you have no question that you are real, but everything else is falselike? Derealisation. Its a very odd sensation, yes, but its not a clear indicator of a problem. (although yes it comes with anxiety/panic alot.) Really you need a doctor to tell you if you have these things, but it does seem to be the case. Ill link you to the wikipedia description of derealization; if it basically looks like a check list, thats probably what it is! The causes are too numerous to list here.
http://en.wikipedia.org/wiki/Derealization#Description