If I can help you it all I would say to get off the ativan asap. I was on it for about 6 months and found that if I didnt take it I would have worse anxity attacks than before i was on it. I had to slowly come off of it and it was horrable. I had very bad rebound attacks. Please google ativan and read all you can on what it does and the side affect. As for the zoloft good luck, I was on a few differnt kinds of AD's so it may take a few trys to find one that works for you. I wish you luck.
Hmuch Lexapro were you taking? To be honest, that is a pretty high dose of Zoloft, I would be concerned about starting out so high, even with you vbeing on Lexapro..these meds are not interchangeable like that. You can't always easily replace one for another. It's far better to be tapered down off one, while GRADUALLY be tapered UP on another. You really may have some bad side effects, and without any tapering off the Lexapro before starting the Zoloft, you may even be at risk for Serotonin Syndrome. I really don't think it's appropriate to be on two SSRIs at the same time.
PLEASE talk with your doc first about this. Is he a psychiatrist? If not, I highly recommend finding one, they are much better at managing these meds.
psychiatric pills take time to build up and work for you everyone responds differently to the same meds you take ok :)