Oh scorpio, you sound like you're feeling really down and overwhelmed you poor thing. I have had 'depressive episodes' several times over the last few years and I know that feeling well - I am on a low dose of anti-depressants at moment as couldn't come off them entirely as would have turned into a complete loon what with all the hormones. Remember you are choc-ful of weird chemicals and natural anxieties so some mood dips are only to be expected.
Some things that I find useful are explaining exactly how and why I am feeling to DP so he doesn't just think I am being grumpy but sees how worried and sad I am and then he can help, not snap. He's not a mind reader so I have to make the effort to tell him exactly how am feeling and then it gives him the chance to respond helpfully, and he does.
Other things - break all these tasks down into managable bits. You are not super-woman and cannot do everything at once, especially not the way you are feeling now. You're only human, and a tired and pregnant one at that, so try to concentrate on the things you HAVE achieved rather than looking at the stuff you can't manage. No one will die or be seriously hurt if you leave a few bits undone.
I would contact your tutor now to explain how you are feeling and get an extention - mine were always fine when I told them what was going on.
Money is tight obviously - ask DH for his ebay money - it's not like you are asking for it to spend on make-up it's for his child's nursery place. Explain all these worries to him and perhaps he can take over some of organisation of finances for a bit? It sounds like you need a break.
Take a bit of time for you - even if it's only for a half an hour. When I am feeling crappy I ask DP to take the strain for a bit and I go upstairs, put on my music/meditate/have a bath. Even when I can only take 15 mins is still lovely.
Leave the housework for a bit - if you have a choice between 'you' time or housework, take the chance to rest.
We're all here for you hon xxxx