I once read a book about independent filmmaking (a passion of mine) in which the authors talked about how to survive that period when you have to do some kind of day job to make ends meet while you're working on your first big film project, without selling your soul or giving up on your dreams.
(And I know what you're talking about. When you're still figuring your soul out, and your clearest intention is to manifest some prosperity to carry you through, sometimes a little Occam's Razor is what you need. After all, if you're trying to put energy into divining your purpose, do you *also* need to be putting a lot of energy into finding wildly inventive sources of money, or do you just need to get a job for a little while? I think it's great when someone's spouse or family will support them through this time, but the spouse or family more often than not still does the joe job to make that possible, so I see nothing wrong with doing the joe job yourself if that's the quickest and easiest way to support yourself for a while.)
Anyway-- the authors advised you to tack "for my film" onto the end of every thought you had about your day job. "I have to go to work today, for my film." "I'm working overtime tonight, for my film." --etc. This was to keep you focused on the fact that your day job is meant to be a means to reach your goal of making a film, and that every minute you spend working needs to be offered in support of that goal. You keep yourself moving towards it, using the day job as a resource that gives you something you need right now in order to pursue that goal.
They also recommended getting a day job that had other resources you could use towards your goal. When I wrote my first play, I worked in a box office where I was freely encouraged to entertain myself in between phone calls, so I wrote the drafts there. They also let me use their copier if I provided the paper, saving me a LOT of money on scripts.
It's a bit mercenary, but I always look at my jobs in terms of what they can offer me besides a paycheck. Positive energy, valuable contacts, free stuff, borrowed equipment, training, free food-- most jobs can give you a lot, if you look at them as veins to be mined.
I'm not suggesting doing anything against the rules or unethical. Just wring all you can from the experience. Take everything they'll give you. Make friends who'll take your calls after you quit. And as you figure out your goals, assess how your job can support them. If it can't, *really* can't, you can probably get a job that's at least a step closer. Just keep your priorities straight and make sure your goals come first.
Not every just-a-job has to be soul-killing or made of suck. My current job is not what I'm going to be doing for the rest of my life, but I enjoy it a lot, and enjoying it gives me energy to pursue the Soul Goals AND frees me from stressing about bills. It doesn't have to be a zero sum situation.
Definitely check out inspiredmoneymaker.com, blogged by Paul Piotowski, one of the fine members of this forum. His post about the "war chest" ought to really resonate with you, and I highly recommend his "Passion Project" e-book. I felt like I had my goals and purpose mostly figured out, but I still took a tremendous amount away from his exercises.
Good luck!!