Hey hun.
I don't know what your boyfriend has because I haven't talk to you guys face to face.
I think he should see a psychologist just to talk about his past (I don't mean it in a patronising way or anything).
From what you've said, I wouldn't rush to conclude it's bipolar, although it could be. I wouldn't rush with the medication also, because it's very strong, and you'd want the right diagnosis first.
It could be that he has PTSD (Post Traumatic Stress Disorder). That's what it sounded like to me anyway. We had a psycho man trying to kill everyone in our complex at the beginning of this year, and I would wake up every morning at four and have a panic attack until sunrise. What was happening was that I was losing control over where I was, I thought I was there instead of here if you know what I mean, in the past. I talked to the psychologist at uni, because it was really wearing me down, and he diagnosed me and suggested doing things like counting the number of buttons on a shirt or the number of handles on a big drawer etc. and it works, it kind of draws of draws you back into there here and now a little bit. With PTSD, you just need some will and hopefully some support, and you sound supportive, but I wouldn't rush with medication, I never had any. (Luckily that man got taken away to the acute psychiatric ward lol so I stopped having the attacks).
It also helped me praying.
I suggest go see a psychologist and soon as possible, and that he needs counselling to work through all that happened to him. Your baby's and your safety are key here, you must remember that. That's by far the most important thing
Also, this has nothign to do with it, but what is heltsuik? I'm just really interested in native culture, that's all. I also had a thought, maybe if he got closer to his culture, and who he is, maybe that could help? I've heard native people are very attached to their land, and I don't know where I'd be without my own (Russian) culture.
Hope this long essay rambling on helped lol.