Who's got advice for me on how to get my life together again?

Where do I begin?
September 1st I was promised a promotion at one of my jobs (restaurant). It required that I rearrange my schedule at my second job (Lowe’s) to give them open evening availability, and this meant cutting my hours at Lowe’s. It seemed like a good choice to make, because moving from hostess to server would mean about $1000 more in income each month.
September 30th rolls around. I am still a hostess. My supervisors decided to keep the person they needed to let go to promote me, and I am now, instead of $1000 above where I was, found myself coming up sadly and consistently short.
I scraped by for about a month, several bounced checks and collection calls later…. I moved in with my mom.
My apartment is gone. I almost had my car repossessed. I’m looking desperately for a new job, but haven’t had much luck.
My mom wants me to pay her $400 in rent each month, but today she decided to dig through all of my things and let me know how uncomfortable it made her to know I owned sex toys. Not only did she go through boxes of my things, the space I am to pay her rent for is a mattress on the living room floor.
When I tried to explain my situation to my boss at the restaurant and ask if I could pick up more hours or SOMETHING, ANYTHING to try to make ends meet, he said that it was my own fault and that I did it to myself.
I am so frustrated. I hate not being able to take care of myself. I’m trying, yes, but it seems that I cant catch a break anywhere. If I was promised something and rearranged things to meet the needs of the position I was to be moved into, and then not given that position, causing me to nearly be out on the street…. how is that my fault? Before I put in my request at Lowe’s to get my hours cut I spoke to my managers and confirmed the promotion in an attempt to avoid this exact situation, and they told me everything was good to go; they were just waiting for me to be available. And here I am. Still not promoted.
It seems that in one swoop most of the things I held dear were removed from the picture I called my life. I need a pep talk. I need direction. I need someone to give me a decent idea of what to do right now.

My car – I have been doing odd jobs to try to get caught up on the payments so it doesn’t get taken away. I think I’m almost in the clear on it.
Living Situation – I’m thinking maybe house sitting jobs found via word of mouth and craigslist could be an answer, but the thing I have going at moms is not working for anyone involved.
Work – ughhhh.

Any helpful advice, suggestions or comments on any of this are genuinely and greatly appreciated.