zoloft question

I started taking zoloft to help with my anxiety.. well i did a bad thing, i all of a sudden stopped taking it. i was up to 200mg a day... when i started to take it i became really tired, loss of appetite and yes, very calm. everything that seemed reasonable... i lost 20 lbs being on zoloft and it made me feel much better.. since i stopped taking it ( for no good reason) i have been eating like a cow, very moody, diarrhea, and upset stomach. is this a cause of not talking zoloft anymore? or is this some other reason.... i am going to start on it again.