I was switched to effexor after 80 mg of Lexapro produced no resu...

I was switched to effexor after 80 mg of Lexapro produced no results for my depression. My Dr. slowly increased my dosage from 150 - 225 and then to 300. Supprisingly, I had only one side effect which was a ringing in my ears, only noticeable at night when I went to sleep. Unfortunately, I had no good effects. After 4 months, I decided to get off of it... and weaned myself down 75 mg a week. Only had a few of the zaps in my head, but really no problems otherwise... I feel even more depressed, because my doctor said this was his "big gun" and that it would work. Since it didn't work... what now?