You could switch to doing the PhD part-time, then it would make sense to work a part-time (or even full-time flexible hours) job, which would leave you with time to do the research. The fees would be more manageable each year (paying each term). I am a self-funding part-time PhD who is working a full-time job. It's difficult, but can be done.

Hi. I am a part-time PhD student and I have had to fund myself by working a day job. Working either full- or part-time would be one way you could support yourself. There are some universities that would pay your fees; you would usually have to talk to your potential supervisor or research co-ordinator in the universities you want to apply to.

I am sure there are organisations that would pay for part-time fees, will find out!