so scared! need support

Back in March(I was 27w pregnant at the time) my bf and I were homeless living in his Mercedes Benz. We worked our asses off and searched So hard to find somewhere to live. A month and a half later, we found a house with a room for rent($600/month for rent and all we could afford). We had to sell our dog to afford to move in, and I had our son a month later. The people we live with drink, fight and yell constantly, there's one bathroom, and 8 people in the house, their son(3yrs old) can't talk and screams all the time(I kid you not he cries every ten minutes). But I can't complain cuz it's better than being in the car. However my bf heard about a new job a couple weeks ago and they told him he basically had the job they just had to go through the formalities and paperwork which I get...what I don't get, is telling him to put in his two weeks(said he'll start on the 1st), introduced him to everyone with the job title, EVEN had him work for two days to get the hang of things, didn't say a single word when he told her that he smokes pot(we live in WA) and had him take a pee test anyways...well he called on the first and they said to come in on Monday, so he went in yesterday and they told him they still hadn't heard anything. She calls this morning and tells him he didn't get it..WE ARE PISSED!!! Who does that to someone?? Now we're scurrying trying to figure out how to get him a new job that will hire him asap, I'm worried sick..I can't stop crying..I don't want to end up back in the car, we can't! I'll lose my son!