This is week 8 of Zoloft and I have noticed a tremendous improvement. My physical symptoms vanished until today... I suddenly became lightheaded and was afraid of 'passing out' which is how my panic attacks usually manifest. It never became full blown. I am just wondering if it is normal to experience rare bouts of panic and or anxiety even if your medication is working? This is the first time in 8 weeks I've had physical symptoms... so now I'm worried that Zoloft will stop working or isn't working well enough. I'm taking 100mg. Luckily, I have a dr. Appointment tmrw. Wondering if she will increase the dosage or if it's expected to still have some 'bad' days.