Yes, bipolar is mood disorder as I'm all to familiar with it due to having a grandmother that was institutionalized many times, a few cousins, and 2 aunts, they exhibited signs of this as teens, just as puberty hit. My H never exhibited any signs in 25yrs that I knew him, depression yes.
Oh depression, the worst, I have suffered for sever depression since I was 12, I'm 46 now, I have been on just about every cocktail of drugs available, even the mood disorder drugs. I think we who have dealt with this, deal differentl. I would never, ever thought of leaving my family. But I haven't gone through MLC, gosh hope I never do, menopause will be just about all I can handle!! Lol.....just like with post partem, you have cases where mothers harmed their children, others severe depression with thoughts never acted on. The brain, that huge complicated organ!!! Hopefully science will figure it out someday!!!
As for sever trauma, just my opinion, as all of the above is....I think when a person has suffered some form of trauma so severe as a child, to,protect themselves, they block. .especially if the grown ups around them have failed to act, or abandoned them. My H had such trauma, for first 3 yrs of our R I barely could get it out of him, and took years for him o share about 95%. He has unresolved issues, he knows it, I think low T and other things. Excuse, I'm not sure. If any sort of mental illness I can't buy it as an excuse, as mental illness is not to be excused. This is not just someone going off to have good time. This is someone who has dissasocciated himself from all the life he knew....and really for no concrete reasons other then..."wanting to be alone"
All confusing, all a puzzle...for me it does all boil down to messed up wiring of the brain that has something to do with this specific age that causes a short circuit...my analogy. Then it is puzzling why some react, others don't, but they know something is wrong.....whew