Hello BipolarMama31: I can't speak to this from the perspective of being a parent of a bipolar child. I'm an old man. But I wanted to reply to your post because, many decades ago, I think I may have been like your son. I recall my mother telling me that even as an infant if I was crying, & she would try to hold me to comfort me, I would stiffen up & just scream. And, as the years went by, I would also struggle with anger issues & have extreme reactions to triggers.
Back then, there simply wasn't the awareness of mental health issues there is today nor were there the services available that there are today. So my "symptomatology" was just assumed to be aspects of my personality or me just being "bad". And, as a result, these aspects of my personality, so to speak, haunted me throughout my childhood as well as throughout adulthood. So I want to commend you for recognizing & accepting that your child is struggling & for trying to do something about it while he is still so very young. I wish you all well...