Depression at workplace.

I am continuously scolded by my boss for anything and everything. I work for 12 hours on weekdays, work even on weekends to prove myself but still i never get a word of appreciation. My boss says i am working extra to correct my mistakes. No one has ever treated me so harshly before this. I am always so afraid before office. Each night I am scared of the thought that next day again I have to go to office. I keep crying most of the time...even now when i an typing this. I feel so worthless. I am afraid i will be able to get another job. My friends and family keep reminding of my past achievements, but it doesn't make me feel any good. I shared this to my superiors too but this made my manager's behaviour more worse. I don't know how to end all this. I do not want to commit suicide, I am blessed with very good friends and family. What should I do? Should i see a psychiatrist or take antidepressants??? Please suggest.