I was okay till December 15 but from jan 16- April 16 almost 4 months I don't like anything, never like to go in a mall or shopping, don't like to spend money or any recreational activity. I slept for almost 12 hours in a day and after that also do not find my body active. I feel lazy through out the day and my appetite also lower. I didn't like to do my factory work as well, always pressurize my self to do normal office work. This had happened to me since 2009 almost every year. I was active 6-8 months full active and 4-6 months in a dull mood in every year. Time is not fixed, sometimes I feel dull in summer and sometime in winter. Moreover I was very quickly upset with even a small thing happening in my dull mood and feel extremely cool when I am active even worst thing happened. Please help me. I am taking desval er 750 for the last one year.Please tell.