I agree with everyone else - grab what work you can, and live as frugally as possible. Frankly, I am surprised that your surprised - the fees are just one part of the postgrad cot, with living expenses taking up much of the rest. Thats something that needs to be factored in doing any post grad course.
When I was a postgrad, even though I was funded by the university, I could always do with more cash. The uni paid for undergrads to guide prospective students around the place, and I was their 'supervisor', which helped a bit, plus evening lecturing. Ask around the uni, and see what there is. It could be bar work, maintence, evening cleaning. Unis often have job boards for this sort of thing. And look at Indeed - lots of jobs, especially seasonal ones.
Tale advantage of whatever you can scavange. Because my girlfriend (now my wife) and I were known to the senior stuff for guiding during events, etc, we got work handing out freshers packs. What wasnt given out was a freebie to us. That included about 40 packets of Super Noodles, plus loads of disposable Bic razors. I didnt buy a razor for about 2 years from that alone.
And really budget for food. Aldi/Lidl is a boon for any student, hoover up cheap meat to freeze from supermarkets, have a weekly meal list and budget to match, and then ebay/Amazon for books, clothes, etc. My best tip at the moment is for cheap new pyjamas - airline ones from Ebay can be had for as little as £2 plus postage, and they are very nice cotton ones, since they are given out to first class passengers! My Barbours have both come from Ebay as well.
Write down what you spend (I had to pay for my first year of university, and that really helped to keep to my budget), go to your local libery and find the book on grant making trusts, etc. then go through them and find anyone that will fund for your subject, place of birth, particular situation, etc. A dozen well crafted letters could bring in a fair amount of money. And never ever get a credit card - I learn the hard way what a pit that can be to get out of.