I've been on Lexapro 5MG for about 3 weeks. The first 2 and a half weeks I was feeling fine, I wasn't having the much anxiety and panic attacks weren't occurring just racing thoughts and depersonalization. The depersonalization has seemed to go away and racing thoughts have slowed down. But tonight I had a panic attack about the medicine not working because it has been 3 weeks and I'm scared I'll be like this forever.