I had my first manic episode this year which resulted in a two week pysch ward stay. Before that I never had any type of episode hypo or manic. 
Because of this I'm struggling a bit with my diagnosis. I just don't resonate with it at all. Is it possible to be bipolar and only have depressive episodes?? It was triggered from taking 150mg of Zoloft for a couple months. Even leading up to the mania there wasn't too much energy or feeling elevated. It was just like bam crazy town psychosis!