Depression and Anxiety. Take to work?

I have already been through an episode of depression 8 years back and had taken venlaflaxin for about 1.5 years and was fine.. my depression relapsed last year and my psychiatrist put me on venlaflaxin but since it didn't work that time, he put me on prodep 20mg , petril 0.25 mg and Mirtaz 7.5mg or something, took petril for about 2 months and stopped but took prodep till November last, that time all meds helped me.. now I'm having another episode of depression and anxiety, been on petril 0.25 mg and prodep for about 2 weeks now.. take half petril in the morning, half petril in the noon and 2 tabs in the night.. taking prodep only once in the morning.. I'm still not feeling good.. there is always mood swings and fear in my heart.. when will I start feeling normal??? How long does the tabs take to work?