I experienced the same .. first go of Lexapro went great then 3 yrs later went back on again and it was a horrible experience. After 3 months of enduring the side effects, I noticed the pharmacy had been giving me the generic Escitalopram. Because this was the only difference from 3 years ago, my psychiatrist prescribed a DO NOT SUBSTITUTE and now back on primary Lexapro with great results and little side effects. It’s worth checking on. There are many blogs online regarding those that are unable to tolerate the generic