How to handle a job you hate?

I took this job out of desperation and now I'm regretting it everyday. I keep telling myself to look on the bright side...that at least I have a job and I'm making money, but I can't seem to make that outweigh all of the negative aspects I'm experiencing. The work itself is easy...the problem I'm having is with my supervisors blatant use of favoritism and scheduling. She's constantly rearranging my lunch breaks to allow certain coworkers to have extended breaks for the sole purpose of going shopping with her. She'll have me clock out for lunch, but expect me to continue to work through my break. She's paid hourly like the rest of us, but she has the schedule rigged so she's the only one who doesn't have to work Saturdays...And we have to work EVERY Saturday. She gets away with everything because she's the "Big Bosses" sister-in-law. It was already going to be difficult for me to spend time with my husband because he works nights, but the way she has things set up I see him at most once a week. I dread going to work everyday. I'm constantly stressed out and angry and lately I've felt like bursting into tears at the most random moments. I've been applying for new employment everyday for the last month and no one is biting. I've come so close to just walking out or not showing up for work. The only thing that keeps me from doing it is that I don't want my husband getting upset with me. I don't know how much more of this I can take before I just crack...