Going through the same thing.
I was on Lexapro for the better part of a decade. Went off over the summer. Withdrawl was very difficult.
Anyhow, I am on day 16 of my second go around...10mg.
Even though I was on it so long, i have had some tough side effects going back on it. Most notably sick to my stomach in the am. It is slowly getting better thought.
Also, I have had a lot more success so far taking it in the morning. ..but know everyone is different. Good luck