Zoloft and how they make u feel?

im 25 fem and suffer from really bad anxiety and ocd my doc prescribed me zoloft and to have 150mgs but i can only really can handle 100mgs abd when i took the 150 i got confussion,sweats,manic,heart pulpertation and slight shortness of breathe.i have gone back down 2 100 and im still feelin funny and nausea with lots of loss stools.cann these just beside affects or could there be something else possibly wrong or is this normal.....