Zoloft help

Is anyone taking Zoloft for PPD/depression/anxiety? I started taking it last year after my child was born and found out 3 months later I was pregnant again. Anyways. It helps kind of, some days I feel great, some days are "normal" anxiety filled days and others I'm filled with rage and extremely angry and irritated all day. Nothing seems to help. I'm curious if anyone has had anger as a side effect??