Zoloft and agony

I was on Celexa for about 5 weeks for panic attacks and anxiety but wasn't getting much better. My doctor switched me to Zoloft, I was on it about 10 days but I decided to discontinue it yesterday because it was causing extreme drowsiness, horrific headaches, weird crying spouts, and more anxiousness. Today, the first day being off Zoloft is harsh, I was in bed half the day and I feel like I'm in a dream and the headache is still there. Although , its about 630pm now and I feel a little better than earlier but not much. Hopefully tomorrow will be better? I'm also on Ativan.