I don't think you want to wait for a possible answer here, if the symptoms are that bad, you should call the doctor immediately and let them know of all the symptoms.
This is a link to the side effefects of Zoloft. It has two pages. Is anything being taken for migraines? There is a warning about taking that type of drug and Zoloft there. In any event, I'd call the doctor, they want to know if there are side effects and they can advise or make adjustments. Good luck with this.
Health Central has a Migraine site, if these are chronic, you may want to look over there too.
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