Thanks for writing to health care magic.
At first we should rule out some medical problems that could cause such lethargy
and lack of interest in work.
Common things like anemia can be ruled out by physical examination. The palms and sole will be pale. After a examination by your doctor thyroid profile may be required to rule out hypothyroidism
as the other cause.
If no physical abnormality is identified then you may require counselling
and motivation from a psychiatrist
to improve your performance
Hope this helps