How long will Escitalopram Actavis work?

Good morning. I'm 18 years old. A month ago, I went to a psychotherapist to see if I was actually going to get something wrong. The specialist found my neurosis anxious. I started taking tablets-Escitalopram Actavis- the specific dose of 15 mg-I take already a month, and still there was no improvement. I have the impression that before I started the treatment, I felt better, I had more opportunities, because I could break my malaise with crying, which led as if to a better well-being, kind of catharsis. Now taking the right dose from 3 weeks on end, I feel only fatigue, lack of any desire to live, etc. So, when can I count on improvement? I know escitalopram should already give some effect, but the only thing I noticed is the side effects. I feel terrible- I have problems with speech, memory, my head hurts, I don't feel like anything. Usually I was a very active person who loved any form of activity, and now I would only lie in bed all day if I could.