OP I think you sound fab and trying to grapple with very challenging issues where others would passively accept the status quo.
As others have observed you sound extremely lacking in confidence which is sad as there is so much you are capable of doing/are doing. You obviously have a lot going for you and are a clever lady - qualifying to teach and surviving in teaching require a great deal of patience and skill! You mentioned earlier on in the thread that you weren't doing very well at your profession - but would this coincide with the death of your father and miscarriage etc? I would not be so quick to write yourself off :) and then are many things in the educational sector you could go onto do if teaching is not something you want long term.
I am really shocked by reading how your H handles money with you, or not as the case seems to be. I will be the only earner soon and dh staying at home with the baby but everything I have is his and vice versa. We work our the budget together and we agree on purchases together. At the moment we only have my account as he's Dutch and also has not bothered to get a UK one yet, but he has access online to my account so can see everything. One day when we are a bit more stable financially we will give ourselves the same amount of pocket money each. We also save for our dd by putting aside ten euro a week in a piggy bank. It's small fry I know, but I can't imagine not being 100% open about finances and agreeing spend with my dh.
The amount of money on an outfit for your child is irrelevant for me - why are you having to pay for clothes for your children out of your weekly money? Any spending on things for the kids come from joint finances surely? And if you want to spend that, you and a family can easily afford it - we know, or we hope we know, that somewhere in that sole account dh has a fair bit stashed away. The issue is one of his control, not because you are spending money the family doesn't have.
I do think you should quietly seek legal advice - from your more recent posts it seems like you want out. I also wondered whether it was worth calling Women's Aid as you seem to be on the receiving end of financial abuse - they can give you advice if you want to split. In a divorce it is typically a 50\50 divide between assets and debt. And your H will also be required to pay maintenance.
Echo the advice for you to get counselling. If you are struggling with depression have you been to your GP? It may be possible to access something like CBT which is very effective. And just taking through the situation with a gp or someone else out of your situation always helps.
And get a bank account as a matter of priority!
Good luck 