I think you have had and still continue to have a lot of unfortunate events in your life . Even one of these would be enough to break people .
I hope that you are able to get support in real life as you seem to have a lot on you . It is important that you and your husband both get a breathing space from time to time , even if a nice bubble bath , reading a book etc .
Again , I will say ignore the judgey posters , who say why didn't you do X & Y ? I would have done this ...Really not helpful now .
£70 k is a good salary , but not in the SE and when you are the only earner .
I think you have to look at the short term , medium term and longer term and how you can get some financial stability . It must also be a worry for you to have to go from owning a property to renting . I fully appreciate that not everyone is in the privileged position to own however .
Obviously bringing down your accom costs would be a start . Are there any options re local authority / housing association properties ? Are you on any waiting lists ? Are there any local charities that can assist you with checking you have accessed all the resources available . Are there any support groups you can reach out to ?
Could you plan to move to a cheaper area in the future , when the children have left school , nearer family ?
Take care 

