I agree with Debaser re the probable causes. Don't freak out, no no, not good. I hope it gets better quickly.
If you find that it does not improve, don't freak out but give your physician a call. :)
Moderator Anxiety ~ Panic Disorders
*~* Not a mental health professional at all *~*
Dx: Anxiety/Panic, Depression
"If you doubt you can accomplish something, then you can’t accomplish it. You have to have confidence in your ability, and then be tough enough to follow through.”