The fast switching between moods reminds me of me...circumstantial stress sends me off to extreme reactions. I was dx cyclothamia, its below bipolar 11, a softer version but that 'soft' word is extremely wrong lol. Basically everything is just too much, lights are too bright, sounds are too loud, touch is too much, ect ect. I think that is the case with others with bipolar as well it just happens a lil faster and more frequently but not the extremes of mania and depression. At least that is my take on it. Good luck and ya see a head shrinker for a official dx so you can get started on the right meds for you. Take care.