I am sorry to hear about what you have been suffering from lately.
I have a few questions..
1) Since when you have been placed on sertraline.?
2) Any other drug that you have been taking along with it?
3) Currently you have become sluggish , drowsy , unable to concentrate? any hing else that you would like to add..
Has the drug been able to make you feel better?
THOUGH , you accepted my query which was not the answer i wanted to give , so here is my answer. I need to tell you what you are supposed to do as of now.
Now ask your doctor to start you on Fluoxetine(Prozac) 20 mg , inititally 2 times a day for a few weeks along with anti anxiety drugs such as buspirone 5 mg also 2 times a day.
What happened with you was that you abrubtly stopped Sertraline , which you are not supposed to do and all the symtoms that you are having are because of that. Moreover , your doctor should have put you on Fluoxetine in the first place instead of sertraline as it has less side effects such as sleepiness, anxiety, tremors,restlessness, often caused by sertraline.
I hope you get well soon , and please stick to the treatment and do not leave it in between as it does more harm than good.