I have GAD, depression, ADHD, an eating disorder, and OCD. I've recently switched from venlafaxine to lexapro. I was on lexapro 10mg for 6 months. Then we upped it to 15mg which I thought was helping. I was having a bad week when I saw my doctor so they wanted to just up it to 20 mg. I didn't like it at all. I felt like a zombie and it took me 3 hours to get out of bed everyday. I'm not back down to 15mg. I'm not sure if maybe this isn't the right fit for me. Lexapro has helped my OCD so much. Sometimes I'm not sure if it should be working better though. 

I guess I'm trying to ask is how did you know the medicine was working for you? Or how did you know it was definitely not working for you? Sometimes it is hard for me to differentiate between my meds not working (or worsening me) and my normal anxiety and depression.