4 week old congestion tips

Al

My 4 week old is very congested she was congested when we were discharged from the hospital and were told it would clear up on its own but she will be 1 month in 3 days and her congestion has gotten worse she doesn’t have boogers in her nose its in her throat and chest I don’t know what to do anymore it’s to the point where she starts gagging or choking . I’ve streamed the restroom and sit in there with her , her pediatrician told us to do saline drops so im doing saline drops and bulb sucker we have a humidifier going but nothing seems to help does anyone have any other tips or tricks to help this ftm relieve her baby’s congestion I’m desperate