One nostril COMPLETELY blocked…HELP!!

The past 4 days, my left nostril has been completely blocked, like just tight and no air flow going through it. This happened out of nowhere. Not even congestion—feels tight and pressure and like no air flowing at all. It’s giving me panic attacks-I’m up all night freaking out because I can’t breath. I’m the one who hasn’t even taken a Tylenol throughout pregnancy. I did get a saline spray, a personal steamer, and a humidifier; Nothing is helping me at all. I have an appointment with an ENT later today but I’m scared it’ll just be a bunch of prescriptions I’ll be too scared to take since I’m pregnant but I’m so desperate for some relief especially so I can get some sleep. If anybody suffered from anything similar to this - please give me any advice. Thank you so much in advance.