About a month ago I took myself off of my 100mg. Sertraline tablets..(originally taking for depression) Right now I m having several tests taken to find out why I m feeling so tired, sad, etc, I have some leftover sertraline pills and want to start taking them again. ;Should I start with 50 MGs or go right back into the 100? My doctor knows I went off of them, right now I m still awaiting results from the various tests and just feel the need for something to take away some of the anxiety. I could call him, but his nurse if not good about getting back to me and since I have some I d like to start NOW. Thank you.