I am going to agree with nursegirl here. Only your doctor can properly diagnose you. Can you tell us a little bit more about your situation? Have you had problems with anxiety in the past? Are you under a lot of stress? So many different factors can cause us to feel certain ways.
Unfortunately, there is no way we can diagnose you online. You could have anything from a viral illness, like a cold, or the flu to something else. What you need to do is visit your doctor so he/she can do a work-up to find out what is going on.