Do you have any of the medication left? Unfortunately, the body dislikes going from 50mg to zero as much as it dislikes 200mg to zero.
From withdrawal suggestions that have come out from the different anti-depressant companies lately, go back to that last step (or even half of that last dose you took to see if it works) and work you way down by 5 to 10mg to ease the discomfort.
You came a great distance getting to 50mg and that's something you should be VERY PROUD of! If you need a little spritz to help with this final phase, it is not a failure. Your body needs some help and you can take a part of the edge off for your comfort and safety.
BTW, try to refrain from being convinced to go on another anti-depressant to help with withdrawal. They all have their own withdrawal experiences. Work your way through this one with your physician's help and enjoy life when you've overcome the Zoloft!
De Lyn Wolcott, CPhT
Certified Pharmacy Technician
American Medical Association Alliance member
Physical Medicine & Rehabilitation
National Pharmacy Technician Association