Went off Zoloft cold turkey, now I read I should have weaned off of it

I quit taking Zoloft a week ago because I felt like I didn't need it anymore plus I gained 20 pounds in a year and have developed other health problems because of it. I am having some weird side effects though. I feel like I have a zing of electricity going through the body every few minutes and I feel nausea. Should I start taking it again and then wean myself off or has the damage already been done and since I am off it already, just stay off of it? I just hate feeling this way and hope it goes away soon!