I have thought about it too, whether it is a sin to be anonymously complaining about my wife. If I was to go to a priest or shrink I would be doing something similar although in private, and not anonymously. Is posting complaints anonymously a sin? I'm here to find solutions. Yes, it comes off complaining and I am guilty of releasing some steam here, but I'm in a situation that has become intolerable. I'm living with someone who is ill and who is forcing their illness on me with the threats of separation if I do not participate in their illness. What would you do? Try to keep the peace and just go along with it? Even if it was only temporary. Maybe for a few months? Maybe it will pass over and get better? Or just get up and leave saying goodbye to your wife and newborn son? Or try to take the son with you and end up in some custody battle? It's not a good situation because she only sees me as the problem and doesn't want to get external help. Which to me is a major sign that she is deeply afraid so much so that she has no care in the world about my health. It's very toxic.
It's not sinful to want to save the family. Far from it. My mother nagged my father until he snapped and left (he isn't catholic) and to to this day my mother still doesn't understand how destructive she was. Had he stood up to her rather than than just put up and shut up, their marriage may not have ended the way it did. I wish someone had told my father to man up and that he put up even the slightest fight. He never did.
Women are like children or animals or blacks. They live in eternal present. It doesn't matter how docile you think your trad friends' wife is. At some stage she will have become irrational, annoying and potentially very destructive. It's women's nature, especially where no grace abounds. Sometimes one wonders what they say in the confessional if its always someone else's fault. I cannot imagine the divine graces needed for a convent to function correctly.
We never fail to notice in our chapels how in some families how worldly the girls are compared to to their brothers. One glance at the non veiled mother is enough to understand why this happened.
I do not believe in therapy, you cannot use words with somone that doesn't reason. My parents went to therapy and all my mother tells me is that they always took my father's side.
It's going to be unpleasant initially when it dawns on her that you are the master of the home, the breadwinner and her protector, but it's your cross and Christ will help you carry it. It's still very much something you can win.