You are suffering some pretty common withdrawal symptoms, and
Zoloft is a drug that most people get some sort of
withdrawal from when they stop taking it. For most it passes in a couple of weeks, but in your case, if it's happening as you taper off on such small amounts, you're getting a stronger effect, or at least that's how it sounds. So slow it down -- let your body get used to the lower dose before you drop down, and keep doing that as long as it takes.