Sick 10 wk old

Samantha
My son is so congested i had to take him to the er to get his sinuses cleared because he stopped breathing when he started getting worked up & was gagging in his sleep. The aspirator, saline drops, cool mist humidifier, hot shower NOTHING is getting the deep mucus out that i hear in his sinuses 😭😥😖 hes barely sleeping, Idk what ekse to do pls help