I experienced the same thing during my first week on Lexapro. I felt extremely withdrawn and agoraphobic, along with extreme agitation and anxiety which I hear is quite "normal" for the initial side effects of Lexapro. I am just beginning my 3rd week of Lexapro and all of these side effects have faded away. Most importantly, I am beginning to FEEL BETTER in general - less anxious, less obsessive thoughts, better mood in general, and I have had less headaches and neck/shoulder tension as a result. It is too early to give a full report, but this week, I do feel like being social again!