Only a quick reply as I'm in work at mo so apologies...
but, yup!! I am diagnosed BP 2 and fully identify with everything you have described - the constant quests, the obsessiveness, the immediate dropping of arguments on my say so and then acting that nothing ever happened, the impulstivity, never feeling satisified even when I get what I think I need, even being called Jekyll and Hyde as you've put in your title belive it or not!!!
Now after years of calling myself a complete freak as I never understood why I just wasn't seeing the world the same as most, I am on meds (antidep and mood stabiliser), don't touch alcohol at all - it made me very dangerous and am under the supervision of a very good psychiatrist. Now, I have my life back, my partner has his life back, we both have a happy life together again - even my cats get an easier life living with a medicated me!!!! lol
I would recommend talking to your OH about your feelings of having researched BP and try to get him seen by a psychiatrist. Unfortunately this mightn't be easy as he probably doesn't think he has a problem - in fact he probably thinks it is you with the problem - this is exactly what I done. It took for me to be put into hospital against my will to recognise that there was something that needed fixing in my head.
I wish you both the very best of luck. If your OH is diagnosed as BP there are meds that will give him his life back, and you yours.
Nut.