Congested newborn stress.

So my baby is 2 weeks old today. She has been sounding stuffed up all day. She can’t breathe sometimes and gets scared and will start screaming. I’ve been using the only saline spray I could find and trying to suck out mucus but it’s not enough. I have to repeat that so often or she cannot breathe again. No matter what she can’t lay flat or can’t breathe. So I’ve been holding her up at more of an angle or laying her to sleep in my lap with my legs slightly up. Today has been so hot and I don’t have AC or anything so she’s overheating and can’t breathe. I am terrified to go to sleep tonight because if I lay her down she doesn’t breathe good. What if I don’t wake up in time? So I’ve been holding her for hours and it’s only 11:30PM. I have to be up at 4 Am to take my boyfriend to work and I honestly don’t know how to get through the night and all day tomorrow. it’s too late for urgentcare and I’m not going to the ER for this if I can avoid it. Would they even be able to help her better than what I’m already doing? I’m cleaning her nose everytime I hear it getting a little stuffy. I am getting so stressed out already. I’m tired and really worried about her not breathing for too long if I fall asleep. What else can I do at home? Advice?