Zoloft was the first AD I was put on back in 2008 and I have been on others since than, I have been back on zoloft now for 2 years, I take 150mg's in the morning, but it's not doing anything for my depression and anxiety and the past 3-4 weeks I have been getting light headed and brain zaps, I think it's time I changed AD's, it's a shame because in 2008 it really helped me. has this happened to anyone else?