The hot flashes and excessive sweating can certainly be side effects from the Zoloft (Sertraline). I was started on Celexa, another selective serotonin reuptake inhibitor (SSRI), three months ago, and had a terrible time with hot and cold flashes, and profuse sweating. These side effects occur because of the increase in serotonin, when starting a SSRI.
You mentioned that you have been on the Zoloft for about a month now. It is a little late to be seeing these side effects persist, but it is possible. Also, have you increased the dosage of Zoloft recently? When you increase the dose of a SSRI, side effects can return.
I sure hope that you get to feeling better, real soon.
The very best to you, Bubbles!... Chuck