anxiety
"I've always been an anxious person, usually I find my anxiety serves me well to stay on top of a busy household, but occasionally the anxiety is destructive instead, like after the birth of a child or difficult times. 
I'd had a horrid couple of years, nursing my mum to the end from cancer and eventually it caught up with me, panic attacks, health anxiety, obsession on breathing, palpitations constantly. 
I went straight onto 20mg as had been on this drug briefly a decade ago. 
The first 24 hours were weird, dizzy, disorientated, mildly nauseous and a huge panic attack. I only slept 3 hours a night for the first 2-3 days. By week 3 I sleep 8hrs a night, have energy during the day and zero anxiety. I feel great! Lexapro is great but be patient"