obsessive compulsive disorde
"I suffer from GAD as well as OCD, with compulsions ruling more than obsessions. My grades at university started to fall and I knew it couldn't go untreated. My psychiatrist prescribed 100mg Sertraline daily and since then my grades have improved to reaching distinctions again. I am also much more calm and don't get angry as easily as I used to. 

Side effects: I sleep muuuuch more and struggle to stay awake in the afternoons especially. Being a former ballet dancer, I don't have much motivation for exercise anymore. I started to note a little bit of short term memory loss (e.g. entering a room and forgetting why I had gone there - nothing major). Worst, however, was chronic diarrhoea. This motivated a change to 40mg Citalopram daily."