It's my assumption that every people undergo the phase while she experiences the feeling of unreasonably-feeling-not-well at various point of time. Though it seems strange as we can never detect the genuine reason behind such sensation. But in my accordance, I believe that most of the time, it's envy towards others advancement which generates this particular kind of state of not-being-well which we must eradicate from our heart in an instant. Or else, this contagious germ will engulf our mind as well as our body unnoticeably. Henceforth, nurture and spread positive vibes everywhere including yourself to make this world a better place.