Going through hell and boyfriend is unsupportive?

My pay plan at work gets changed today which actually makes me lose a couple hundred dollars a week even though they try to make it sound like I will make more $$$ I wont. I have worked here for 2 years. I am 7-8 weeks pregnant and cannot afford to lose this money even if I wasnt pregnant. Combined with pregnancy hormones I just cannot handle this right now and am severly depressed. My employer knows I am pregnant as well. I am also a diabetic and I am considered high risk for that reason and a few others. My stress level is through the roof. I couldnt even breathe this morning. I work 10hr days and put a lot of effort into my job. My boyfriend is being very unsupportive. He went out all night right after work, knowing the kind of day I had. I was sick, stressed out of my mind, had 1 hour of sleep from the night before and had low blood sugar of 50. Now he gets home a few hours later than he said he would be smells like alchohol which makes me want to puke and I have low blood sugar again. He can't even mentally support me or make dinner with me. I can't even stop crying today. He is being so mean and insensitive. We cannot afford to go without this money. I dont know what to do but when I need him he just doesnt care sometimes