sounds like depression to me. if it was "just" a physical ailment that zapped your energy, your mind would be urging you to go, do...

try and think about what obstacles you have recently hit in your work... maybe you can sort out some one thing that has stumped you, blocked you, and makes you feel like giving up? If you can go around it or get rid of it, you' might be able to get back on track?

<font color=blue> meditation is a true way to connect to the Source </font color=blue>