It most likely is the increase. This is all very weird to me however, as I never personally experienced any symptoms going on to Zoloft or any other SSRI for that matter. It may just be because we've proven that my body NEEDS the SSRI, that maybe I just don't experience these "start-up" symptoms like everyone else. When we get to talking about
biochemistry, things get complicated obviously.
Hang in there and let's hope that once the drug settles in your system that the panic will stop. I believe you can go up to 200 mg of Zoloft and that's the maximum dose.
Continue to feed information back to your doc. Keep us updated and hang in there!