Sorry wondering, I hadn't seen your posts when I replied! Goes without saying that I am "ditto"ing both of them about discontinuation!!
The only thing wrong with your theory is usually bi-polar generally shows up by early adulthood. Like early 20's. If your W is Bi-polar she would have been diagnoses way before now.
I need to find the link (I believe it's in the DSM), but about 9% of bipolars are diagnosed at midlife, and have their first significant manic episode then. My H did have symptoms in his youth, but I only can see that now much like MLC, by looking back and creating a timeline. His parents weren't the kind of people who would have encouraged psychiatry, to say the least, even though there is a large history of mental health problems in the family (the shame of that actually makes them less likely to want to have a diagnosis in the family, I believe). His problems do run bigger than MLC, but as many people have told me, you can't help someone who doesn't want help. So OW now has to deal with the mood swings and the attitude. Good for her.
T, just to point out a pattern I have to watch with myself: I start to detach and everything is going great, then I find myself in the middle of the night googling Hoss problems. It's not the googling that's the problem, it's my brain's reaction to detachment. It tries to pull me back to where I was at and comfortable!
Is there a chance your brain is doing that, too? That you were getting more steady and stable and then this presented itself, and you were emotionally pulled back in to treat this as a crisis that is brand new? Will bringing this up to your colleagues make them feel you're focusing too much on your xW again?
The goal should be to get to the point of seeing these things and NOT being emotionally moved by them. Should they be considered? Sure! You can say, "Oh yeah....I could see where that may have been an issue. Maybe I'll mention it to OW next time I see her...or not...since it's her life." I post links on my Google+ page sometimes, to things I would have shared with the old Hoss. If he cyber stalks me, which periodically he does, he can see them, but it's not why I do it. I just have to bleed the vein, and that's the best way without overtly reaching out. I had to stop trying. God showed me He had it under control, and didn't need an assistant.
Could Hoss perceive the links as helping or hurting? YES. LOL Whatever personality he is in will interpret them in whatever way he wants. In the meantime, my page can be a bit of a bookmark for other people who are googling these things, too (I get comments sometimes that show it's good for that, too). But mainly it's for me.