Are they setting up to fire me . . . What do I do?
Don't you dare suffer for his art. If he wants to suffer for his art, that's fine. It's his life. You can drive him to his gigs, be his sound engineer if you want, and be his biggest fan, but he's got to take on being the damned artist.
What's clear, to me at least, is that you should not wait for job openings to apply to the companies that interest you. You should get clear on your unique value proposition, and let them know you are available. You should also talk to as many people in these companies as you can, after you've done as much research as you can, and get their pain points, and what you could do to alleviate them.
Everyday I dread going into work. How do I politely quit my job?
You will be happiest when you are working in areas that you enjoy. Show up with a different level of enthusiasm. Bring excellence to everything you do.