Meditation in day to day life I lost my interest in things,I just do only day to day life.Is it depression?This  happened some months  back. I think it is related to my vipassana meditation. Now in meditation saw the sadness and negative  thoughts comes ,stays and goes. But only see the sadness not happiness. So what shall I do to pass this state?
Perhaps you should augment your vipassana with other meditations intended to cultivate virtuous minds. I would suggest meditations on the four immeasurables : https://thubtenchodron.org/2002/11/love-compassion-equaminity-joy/