anxiety
"Have been on and off lexapro for the last 20 years (more on than off). This time I was off the medication from for about 5 months and the anxiety and depression was back even though I had a change of life style, doing plenty of exercise and changing work environments.  For me the side effects were feeling nauseous, insomnia (normally 1 nights average sleep and the next no sleep, constant swallowing which I think is called dry mouth and just feeling miserable for the first 3 weeks.  I'm into my fourth week now and sleeping a lot better and feeling much better in myself.  
If you are having the same side effects, hang in there as life will get a lot better"