I strongly urge you to seek professional medical help. If going to a psychiatrist is not helping, visit any doctor you trust, who in turn can direct you to other resources. You may be better off with a psychologist.

I personally know lots of very successful people who have been through depression, and seeking professional help has helped them. Rather than relying on non-professional advice, I would urge you to talk to someone trained to deal with mental health problems. Best of luck.