SuBaroo, I have just read this horrifying thread. I understand from it that you are a Christian? Presumably your husband is too? Did you promise to obey him? If the answer to those questions is yes, then I am going to deviate a bit here, but I hope it helps you a little.
We were educated by Jesuit priests and they often came round for dinner; many lively and funny discussions took place round The Parents' kitchen table, throughout my life. When my brother got married he wanted a catholic ceremony, officiated at by one of our family friend's, a wonderful, funny, very human, and very wise Jesuit. I was immensely surprised to hear bro's wife include 'obey' in the vows. My brother is a truly nice, generous bloke but no one says 'obey' now, do they? I asked her afterwards why on earth she had included it. SIL explained that while she (as the non-catholic) was going to 'instruction' prior to the marriage, it was explained to her that the burden of the obedience thing was actually on the husband. That the wife promised to obey 'reasonable' decisions made by the husband, and that the spirit of the vow was that any decision (ultimately made by the husband as someone has to take responsibility should it be the wrong decision) should be made only after full discussion of all aspects in a truly loving, caring, open minded and respectful way, taking all circumstances into account, and weighing wife's needs as greater than his own because he is responsible to her for the consequences of the decisions, and particularly as he is promising to love and cherish her, and to be responsible for her happiness.
In the light of this, your husband could try to convince you (properly convince using loving kindness, reason and sympathetic, respectful, openminded discussion) that the right thing to do would be to opt out of your support group: Mumsnet. However, if he cannot muster reasonable argument to persuade you kindly and lovingly that this is the right step, then you are not obliged to pander to him and you are not breaking your vows by not doing as he asks. In truth, he is breaking his promises to you by making unreasonable demands on you, without proper discussion. A marriage, in the view of the church, is a bond between two equal people, freely embraced. In no sense is any marriage, christian or civil, meant to confer power to one partner at the expense of the other. If that happens, then the marriage itself is being abused and denigrated, and the sacrament itself is brought into disrepute. In other words, it is a corruption of the state of marriage.
I would add that the above interpretation of a christian marriage, given to my SIL during her instruction, was by another friend of our family who was (died recently) quite a senior Jesuit at Farm Street Church (a significant catholic church in London), and believe me, you can't do much better on theological matters than the Jesuits.
Oh, and not to forget, that your husband's expectations of you should be discussed and agreed (freely) between you, and reflect reality.
And on a purely personal note, with my ex-catholic hat off - you've got 4 kids under 7 and YOU'VE BEEN ILL ffs! No one could manage under those circumstances. You need a cleaner at the very least.
Apologies if this is completely off the wall and has no relevance. I sincerely hope that you are all right and that you get back to us soon.