Lexapro

Had my 6 week pp check up today, and I honestly broke down crying ... I was so nervous to tell my dr... I suffer from anxiety even before I had my baby's girl.. she's my first and thru out my pregnancy my anxiety seemed to go away but now I felt it's back.. I blow up on my bf ... I feel like I've been mean to my 2 step sons... so she prescribed me lexapro ... I would normally take xanax for anxiety before my baby.. so she prescribed me 5 tablets for anxiety attacks... I'm nervous if the lexapro will help? Has anyone else prescribed this? I'm literally at my breaking point ... xanax has always helped bc its always worked for me... but the side affects of being sleepy and how it can get addictive make me not wanna rely on that... so my question is , lexapro? Is it guna help me 😔😔😔