Hi Rachas Bhai(hope you are younger than me)
As said by everyone in this thread, the root cause of your depression is your work schedule.
Please remember that we all are human  being, not a machine and our body needs periodic rest.
I know, it is easier for us to ask you  to take a day off from your work without knowing your financial situation. Having said that, the only solution I could provide is  to invite you to visit me and my family in southern California for the winter break. After visiting us, you might find a new friend on my little son, who will keep you busy with his errands.
Please do not let your negative thoughts dominate you.
Good Luck!