You aren't hijacking at all. This Thread is about how women create problems out of white noise.Maybe I am highjacking here a little bit but please forgive me.
As an old fart, I can see a few patters in your experience, but I'm not a Certified Marriage Councilor and I'm not going to name them here.
What I can say is that women have short cycles and long cycles. It seems yours is coming around on the long cycle. It is merely disguised as an exacerbation of the short cycles. I'm going to post a link about: "the specific pattern women follow before divorcing their husbands". Especially notice the part about, "They blame their partners for their behavior...and eventually, after making themselves and everyone around them miserable for an indefinite, but usually, long period of time, they end their relationships or marriages."
I don't care if you reject the words, "divorce" and/or "cheating". I want you to recognize that a long cycle exists. Your wife might not be headed for cheating or divorce, but she is showing signs of the long cycle arriving.
http://womensinfidelity.com/divorce-why-women-divorce.html