Of course I'm no doctor, nor do I claim to be. I do have life experience, which I call PhD (pain has decimated).
Firstly, I empathize with your feelings of depression. Is it situational as in a devastating event or life-changing experience? IMO that's easier to overcome, as time does heal. Stay active and engaged with work, hobbies, loved ones. Exercise and replenishing sleep/rest are also very healing until the grief can run its course.
Caution: Sleep, self isolation, darkness are seductive. Don't allow yourself to withdraw.
I suffer with clinical depression, and have been treated with meds for most of my adult life. My experience is that medications for depression (as a whole) take several weeks to feel effects. So MY ANSWER is NO. I am not familiar with Lexapro, so I could be wrong. I don't think so, though.
Can you seek a therapist, counselor or your pastor to talk through your issue? That is VERY helpful, not only to purge, but to feel less alone and frightened of those sad feelings.
I don't have any magic pills or easy answers. I do find that it helps me to talk through my feelings with a person who is not vested in my personal life. I'm here if you need to talk. I hope that helps. Oh, and my pastor always said "If you're feeling depressed, bake a cake and take to someone who needs their spirits lifted. Share it along with conversation and laughter, which is like a medicine for both of your souls".
