Hi , I worked my way up to 100mg of Zoloft slowly over 6 months . I have been on 100 mg since April. About a month ago , my anxiety kicked in bad ! I feel jittery and shaky.. my doc wants to increase it but I want off ! Why did it just quit working after being on it ? I only weight 106 pounds .. it is possible this dose is tooooo high ? Help ! Please and thanks!