Jessie J has been diagnosed with obsessive compulsive-disorder (OCD) and attention deficit hyperactivity disorder (ADHD). The 36-year-old pop star revealed the news in a candid post on Instagram in which she explained she sought medical help after welcoming her first child – son Sky – last year “exposed” a lot of her symptoms. Jessie wrote: “Hello. I was diagnosed with ADHD and OCD about three months ago. In telling people a lot of the reaction I got was, ‘Yeah I mean we knew that’ (which I’m sure some of you are doing right now) and of course I knew to some extent but having a baby has let’s …