Hello again and sorry for the delay in getting back to you.
1) You have clear grounds for a divorce based on your husband's behaviour. I would advise you to issue divorce proceedings as soon as possible, as the only way to get a legally-binding agreement in relation to finance and property is within divorce proceedings. That can be either a consent order (if you reach agreement) in which case neither of you will need to go to court, or a final order following contested proceedings, both equally binding.
2) Given the enormous difference between your husband's income and your own income, you have a strong case for maintenance pending suit ie maintenance for yourself until a final financial order is made by the court to cover all the matrimonial assets as well as maintenance.
3) Rearding the financial situation overall, you haven't said how much the house you are currently living in is worth, nor have you said how much is the total mortgage on that property. Without those figures, I can't give you a detailed answer. But what I can say is that once a divorce petition has been filed at court, if you & he cannot agree how the assets should be divided, either side can apply to court to ask the court to decide how the matrimonial assets ahould be divided. The matrimonial assets are everything in your name, everything in his name and everything in joint names, including any savings of either of you, and pension entitlements. The court could for example order that the house is put into your name (if it is not already) and that your husband pays a lump sum to reduce the mortgage to a level that you could manage, and in return, you might agree not to make a claim against his pension - this is only a suggestion, and I don't have all the information necessary to be able to predict what the court might order.
However, going to court is expensive, time-consuming and stressful, so if you can possibly reach agreement with your husband, that would be better. You can negotiate either between yourselves, or via solicitors' correspondence or via mediation. Mediation is a round-the-table discussion with you and your husband, together with a trained and neutral mediator, whose aim is to help a you both reach a fair and workable compromise. Here's where to find a family mediation service local to you:
The family court anyway now requires the parties to have attempted mediation before it will consider an application to court.
If mediation fails and you do decide to apply to court or you just want some face-to-face legal advice, here's where to find a specialist family law solicitor:
From what you say, ir wasn't clear to me whether the house was now in your sole name or not. If it is not, then you need to register a matrimonial homes right of occupation at the Land Registry, to protect yourself aginst the possibility that he might try to sell the property without your being aware of this.
Either way, you need to inform the building society of the situation, and see if they will give you a payment holiday or at least allow you to make interest-only payments for a while, to give you a breathing space.
You can claim child support from him as soon as the baby is born. Here's where to find out more about child support:
If you are no longer being financially supported by your husband, then you should be eligible to claim working family tax credits and child tax credits. The best place to get help with claiming benefits is the Citizens' Advice Bureau. Here's where to find their local branch:
I hope I've given you some idea on how to move forward, and that this helps.
Thanks and best wishes...