Hi Danielle:
I do not understand why would you or doctor increased the dosage of the medication if you were doing well with the previous zoloft amount, in any case I heard than instead of increasing the dosage, in order to gradually get you off the medication you are supposed to decrease the dosage or lenghten the time between intakes!!!
Please seek medical advise right away or go for a second "medical" opinion.
Happy Valentine's, I hope you get better,
Hugs
Midi