Hi OP,
This sounds pretty horrible at the moment for you. Sorry you are going through it. Your story rang a bell with me when you said that on the outside you present as a strong, capable person, when behind closed doors you feel you are being passive and weak. You feel passive and weak because he is subjecting you to a campaign of abuse. This is not a slight irritation. It is a huge thing and it is with you 24/7. Abuse - Emotional Abuse - makes you feel confused, unsure of yourself and generally scared of putting a foot wrong. It is not your fault and I very much doubt that the situation is caused by you 'caving in'. He is causing the situation by trying to control you by fear. This is what bullies do.
So this is Abuse, which means recognising that you, yes you, are in an abusive relationship. It is hard to know how to deal with it or make it right because essentially it is not a situation of your making! He is doing it. It doesn't matter why - although you are agonising over the whys and wherefores endlessly as if that might help with a solution. This is what it makes you do. He blames you for everything that goes wrong in his dissatisfied little life - and you can be forgiven for thinking that you are then responsible for making your relationship work. But it is in fact impossible for one person to make a relationship work, if the other person is actively sabotaging it all the time. I am sure you actually have 'given him the chance to demonstrate that he can be any different'. What if he doesn't WANT to be any different? I'm sure you have protested and flagged up and disagreed with him on several occaisions, but he has shouted you down and made you feel afraid of voicing your opinions.
Walking on eggshells around someone, feeling anxious about the next thing that is bound to go wrong, treading carefully - all these are symptoms of your fear. Bullies don't rule by team-work or consensus or persuasion -he wants you to do what he wants by scaring you and grinding you down so you're so exhausted you don't pipe up. He wants control and he doesn't see why he should have to consider what you think.
This is all shocking stuff, and I can see why you are not wanting to see a lawyer at this stage. The most shocking thing is when the real picture starts to emerge. The conversation in my head went like this:
'Oh, so I am in an abusive relationship am I?'
Yes, your DH, the person that is supposed to love you most in the world is abusive and vicious and bullies you. Your family and those that really love you hate seeing you treated this way. They have seen you change from the strong, confident person to someone who is tentative and a bit afraid.
'Surely if he only knew how unhappy this makes me, how undermined and disrespected and unloved I feel, he would change his behaviour.' No he wouldn't... he knows what he is doing. He gets what he wants out of behaving like this. God knows why terrorising someone else gives him what he wants, but if he wanted it another way he would not be behaving like this.
'His behaviour is hateful and vicious and awful. He says he loves me, but he behaves as if he hates me. How can he be like this to me? Someone he loves?'
He doesn't love you. Nobody who loves you and respects you would treat in you this way.
Oh Shit.
This is where it gets you and this is the reason it seems far, far too much to take in. This is a run-down of what I know as I have been through it with the man I thought would love me forever, the father of my children, the only man I ever wanted children with etc etc. I never thought he would ever be unkind, let alone vicious, cruel and abusive. You don't want to believe this is what it is, but there is no other conclusion. This is not love.
The next steps are yours to take. The best thing would be to find as much RL support as you can, your friends and family must be concerned for you - you said before that your mother was shocked what it was like after the birth of your second child. Don't feel guilty or ashamed in telling them. You will be surprised by the number of people who are already desperately worried about you. They will want to help. Gather all the support you can.
And then see a lawyer. Good luck OP, it's horrible, but you will be that strong person again.