You sound very anxious and I am wondering if you are not projecting some of your anxiety on your child-caring.
On the one hand, you blame your husband for making mistakes with the children, on the other hand you don't seem all that confident yourself, but seem to suggest that caring for two children is a two person job. You need to sort out what is realistic here, and then think about how you can make the best of the situation. So the basic premises here are:
*at least one of you does have to earn the family income- which means that either one parent will have to provide daytime care for both children, or you will both have to work and earn enough for childcare (note that childminders tend to be cheaper than nurseries)
*it is no longer realistic in the 21st century to demand to be supported by your husband- this is an age that requires flexible (and non-gendered) solutions
*jobs are hard to come by at the moment so it is probably fair to think that both of you need to try as hard as you can and not give up
*if you feel overwhelmed by the children, then it is hardly fair to blame your husband for feeling the same- the good news is that families can survive a few toilet rolls down the loo as long as they approach the matter with a sense of humour
*toilet rolls down the loo is an absolutely normal part of family life. As are scribbling on the wall with marker pen during the two seconds when you turn your head to deal with an unavoidable emergency. Why do you think Dulux do those telly adverts- it's because people can relate to them. This is not a sign of failure: it is part of being a family.
*you may want to look into why you get so wound up about minor misadventures- are you in good health? could you be depressed? is there something about your move from your childhood world that you haven't quite processed? It is not quite normal to struggle so much with the kind of ordinary poor-eating, low level naughtiness of a 3yo. Find out why this is so hard for you. And then try to address that problem.
*your son's eating. I don't think you will get good results here by chasing him with a plate. Or by getting worked up over it. Ime (large extended family + one fusspot of my own) a very low reaction approach works best. If the main carer gets stressed about it the problem tends to get more entrenched.
*could it be the case that you feel resentful because your childhood expectations are not being met: there are no maids and suddenly you are expected to do the work of a maid? It is hard when our expectations are not met, but human beings are resilient and can deal with a lot of change. Otherwise they would hardly have survived millennia of upheavals and wars and natural disasters. I grew up in a family where all the children enjoyed rude health and happily spent their time on outdoor pursuits: realising that I had given birth to a child with a chronic condition which would make that kind of childhood impossible was a hard pill to swallow. But we got through it. You learn to adapt, and when you can't do what you expected you do something else that is fun instead. We have had an enormous amount of fun, just not in ways I expected.
- are you lonely? do you have friend to support you? a social life? things always seem harder when you are alone.