Ask HN: I lost interest, what should I do?

I have started a startup and worked very hard to make it successful until it got funded recently but as soon as partners came in the pressure increased 100 times and all of a sudden I am doing job in my own company. I have lost all the interest in work as well as company. I am very depressed and started drinking everyday just to sleep without feeling worst and directionless. I stopped going to office leading me to question my existence and having suicidal thoughts. please help me find a purpose in life.