Zoloft and odd symptoms

I've taken Zoloft on and off for three years for anxiety, panic attacks and agoraphobia. I started with 25 mg and have gone up to 75 mg/day. I am now on 25 mg/day, which my physician calls a "placebo" level. Initially, I considered Zoloft a miracle drug; I was able to get out of my house and was no longer suffering debilitating panic attacks.

I went off Zoloft when I became pregnant and resumed taking 25/mg the day I delivered my baby two years ago. I had suffered from postpartum depression and anxiety with two other babies and decided to be proactive. It worked; I did not develop PPD.

I "ramped up" my Zoloft to 50/mg day when my baby was one year and that's when the weird side effects began. An especially verbal person, I was having trouble coming up with the right words when speaking. I'd feel a weird shortness of breath which seemed to come and go and seemed to have nothing to do with exertion. In an odd way, it seemed like a blunted panic attack and I'd feel this sensation when I was not active or engaged in an activity.

I've never taken/done recreational drugs, but I do feel a bit "off", fuzzy and sometimes dizzy, like I'm on something. I decided to go to a lower dose and nearly all oft these odd symptoms disappeared...I'm back to 25/mg.

I'm afraid to wean off Zoloft completely, so I'll stay at 25 for now. I'm a tiny person, so I think we have to find the levels that work best for us; I've always been sensitive to meds and find that the "usual" amount, even OTC's dosages are too much for me.