BP is simple

it is rapid mood shifts with extreme highs or lows .........depression to hypomanic mode ....fast talking ...ideas are coming out none stop .....getting into a project and forgetting to eat or sleep ....u keep running problems of the day in your head over and over and over in a loop pushing u on one side of the scale or other ( think hulk but sad want to die and happy u are on top of the world )

basically just chemicals in the head are off ........so your mood/emotions are effected easily

as for having it can be a curse or a good thing some ppl in history have done great things with it driving them others when completely batty and ate ppl (they had other issues too)