It's getting late ( for me - I'm usually up at the crack of dawn ) so I will try to be brief and we can discuss further if need be.
1. You should consider registering
matrimonial home rights if the house is in his name, to prevent him selling or mortgaging the property over your head.
2. Do you work ? Is it possible you could afford the mortgage with a combination of your earnings, if any, tax credits,child benefit, and spousal maintenance ? Sorry but I don't know and need to know.
3. Re-possession is something to be avoided at all costs if you can. They will charge you or your husband all sorts of penalties, surcharges, costs, legal fees, you name it, and they will only be interested in getting their money. Your husband may need a little persuasion that re-possession is equally bad for him.
4. I recommend strongly that you get a full benefits check from a CAB,
5. The bottom line is that you will not be homeless. You have a child and therefore have a priority need for accommodation, ie the Council have to re-house you.
However such accommodation may well be substandard and
it may be better to get accommodation on your own account , and don't forget to investigate council tax/ housing benefit.
6. Spousal maintenance is worth investigating.
Sorry, that's enough for tonight ! But we can carry on tomorrow if need be.
Sweet dreams.
Mike