I was on the streets for a few months when I was fifteen. I feel that a lot of my strength came from that, in regards to my ability to make the right choice irregardless of the consequences. I think sometimes you have to learn that you're able to do without in order to learn what you're not willing to do to have something. Point being, after seven years I would expect you to have far more of that strength.
They have demanded immediate payment but in truth I feel the situation can be delayed a while longer. But, that's just optimism probably. I highly doubt they will complain to such an extent if I am able to pay even half of it. That'l surely buy me some breathing room and time to sort the rest out.