Hi Greymalkin I'm so sorry to hear your news 
It's sounds as this has all come to light rather quickly which must have been a horrible shock for you, especially when you are in the middle of a house move. I'm so sorry you had to give up your course too.
If you look:
here you will find quite a few good tips on these threads.
[Just for info - dh and I inherited a lot of debt from his parents who then became financially dependent on us until they died - it has taken many years to get our heads above water again but we are now ok financially - I know you are not in that position yet but just mentioning this because I want you to know that it can be done!]
Sounds as though you are already engaging in some excellent money saving measures but fwiw...
During that period we lived on a very strict budget (and still do). Sounds obvious but I think budgeting for that day/week/month and sticking to it is vital.
Not going out with credit cards only a small amount of cash.
Making lunches not buying them.
Hardly ever going out 
though this sounds (!) - all entertaining from home - cooking from scratch (easier said than done if you are working though I know). This is still expensive though but I've found that people are usually very happy to bring one course or to bring wine or a pudding.
When Internet shopping, always allow yourself 24/48 hrs "cooling off" period leaving things in the basket before actually buying anything - I have saved lots of money doing this - asking myself "is it really essential"?
Buying reasonable quality clothes for dc (think very cheap ones are a false economy because they don't wash and wear) but buy them too large!
Having a roast joint every Sunday or every other Sunday and have cold cuts on Mon with veg or salad, shepherds or cottage pie Tuesday etc and/or make stock with bones.
Bake your own cakes/biscuits for lunch boxes.
Meal planning. Eating food that is in season. Veggie night once or twice a week.
Eat lots of eggs and pulses.
(Incidentally my db has just been made redundant and he is the sole wage earner for a family of four living in London. He swears by frozen food and says you waste very little buying frozen veg etc.)
Our house is a bugger to heat and we follow these general rules:
(a) don't let it get totally freezing before you put the central heating on [low] in autumn (it's a false economy as it has to use more energy to heat the entire place again - better to use residual heat from mild weather to kick start the heating up process ifyswim).
(b) have the thermostat permanently on 17.5 during the day/when you are home and wear a jumper or a gilet (or both) if you are cold in the evenings (sofa throws also essential while sitting still watching telly).
(c) have two duvets on each bed.
Only run wms, tds, dw when carrying full loads.
Double up with friends and save on petrol when collecting dc from school trips/sleepovers/sports events. (Same with baby-sitting - take in turns.)
For my clothing - I virtually wear a uniform - and lots of my clothes are the same colour or the same two colours - so I can just buy a couple of pairs of trousers and tops every other year and they all mix and match and all shoes/ accessories go too (I know this sounds a bit sad but it really does work!)
For Christmas and presents (have a big family plus a small office load to buy for) plan out very carefully and budget in advance (with a firm limit for every person and every group of people) and buy things in the sales/throughout the year.
Good luck with it all xx