What should I do, I can't sleep!I feel depressed in a way?

Okay, So I'm a mother of two boys. I am 24 years old. My first son is 2 & a half years old and my youngest is 9 months soon to be 10months. I've pretty much raised them on my own, no help from anyone. They are my world. They are my air I breath. But I feel like a total failure. Their father and I (I just broke up with again, that i do not plan to ever be with again) haven't really ever got a long. He's very controlling. Verbal abusive, sometimes a bit physical. Also lazy and won't find a job. I didn't want our sons to grow up seeing this. So we separated. But I find it over whelming sometimes because I have no one to help me or talk to. My family consist of My sister, brother (which I also take care of, I have custody of, he's 15years old), my father and that's it. I do have many friends. But I just hate asking for handouts or help. Not b/c I care what they think, but b/c I feel Like I am the mother and I should be able to provide my babies with everything on my own. My brother is a handful, he has a few addictions (see our mother passed away last march from cancer, and then my grandma who raised my sister and I passed four month after her. She was the one I also talked to her, or helped me when I needed it), and I don't know how to handle him. He also has a few anger issues. But I also feel over Whelmed dealing with my babies father, even though we aren't together he still doesn't try hard enough to help with his boys, or even see them. I also hate my apartment. There are so many things wrong with the place, and the neighbors are loud and drunks. I would like to move into a townhouse closer to my sister. But that will cost me a lot of money as well. And my sister came over the other day, and I got her to take a look at my son's leg, it looked to me like spider bites, but she said they might be bedbugs, But I'm a very clean person how the H*LL could I have them. So now I'm going to have to deal with throwing out all my beds/couch and washing everything I own, and telling my landlords (which is very embarrassing as well). I just don't know what to do, Can anyone please suggest something to me.... or a way I can sleep at night? What should I do? .... OH and I also want to go to school and finish my High School so that I can go to college and get a REAL career job to better take care of my boys and brother. But that will also take time and money... can someone help me with a plan? Please and thank you ......