Zoloft making me feel pregnant? Anyone else? Please help!

Hello, I just thought I would throw this out there cause I can't find anything else on the internet... I'm on 50 mg of Zoloft for anxiety/depression/panic disorder...(have been for 2 months now) I'm 9 months post-partum and keep getting dizzy/nausea spells.. wether I eat or not. It's in the morning usually and goes away by afternoon, but I feel totally exhausted by then. I'm also getting headaches here and there, and extremely thirsty. Some of these symptoms are exactly how I felt with my first child when I got pregnant last year. I took a test the other night and it was negative... I'm wondering if anyone else has experience with anti-depressants and feeling like you are pregnant? Or maybe it's all in my head...? It's driving me crazy!