At times, we must be careful that we are not making something bigger than what it is. Are you really sick or just playing pretend? If it is all in your head then it is time to go back to work and not make excuses.
Learn to focus on your goals unless you have real condition that calls for medical attention. According to the DSM 4 it is obsolete, but some people may still suffer from a somatoform condition. Somatoform conditions can lead to unnecessary treatments, be very careful due to conditions that can rupture internally.