OP - reading your post and updates made me feel so sad.
You seem like a nice guy, who was trying to work his way through the situation and educate himself about possible options. You didn’t deserve the pile on from some posters.
I agree with others that you’ve been bullied, coerced, manipulated and emotionally blackmailed into making this permanent decision. This was a decision with permanent consequences for you and you’ve been forced into it.
My DH and I are considering the same thing. He is 41 though and says he is happy with our 2 kids and would never want more. I’ve told him to think long and hard about having a V as I’m happy to sort something else out if he’s not sure for any reason. He wants to go ahead and that’s great, but I would have no issue whatsoever if he decided not to.
Your relationship does seem like it is abusive based on what you’ve said. In terms of moving forwards, I think you need to access support for abused men - having not dealt with abuse I’m not sure what that is but I suspect a google search would help along with advice from PP here.
Your wife’s controlling ways may have snowballed - she controls one thing and cuts you out and it spreads iyswim. She may be willing to discuss it and work through things with counselling although I doubt it based on her reaction to your suggestion to get help over this one issue. She may try though if you outline all the issues you have ?
I agree with others though in that it sounds like your relationship is probably over and she won’t tolerate you trying to change things for the better. She’ll probably look to end the relationship (although I suspect this is more likely when full time childcare isn’t needed anymore).
I’d be trying to “get my ducks in a row”. Prepare yourself for her wanting to leave - get the financials sorted (learn what you / she has and where), get a job if possible even if it’s part time - it’ll give you somewhere to meet people, make you more employable in the future etc etc...
Good luck. I hope things can work out for you.