I see you said you are not on meds., have you been treated for Bipolar? I think a mood stabilizer may help with this, I'm surprised being Dxed with Bipolar that your doc isn't working on treatment with one of them.
I often wonder with myself, if in the past, before my DX and treament plan, if I had mixed states, I can't put into words what I felt, but it wasn't pleasant, sort of like PMS to the max., the other states, depression and hypomania were always more obvious.
I wish I had something to reply with, but when I read your post this is what came to my mind.
I could appreciate you asking for a non "text book" description. So often it is a big help to listen to real life experiences, from real people, not reading or being quoted to you from the professional.
I wish you luck with this.
DE