bad cough?? help please!!

Chey • Boss wife 👑 Boss mom 👩‍👧
My daughter is 11 months old and she has a bad cough, but only when she sleeps it get so bad that she starts projectile vomiting I'm really worried and her doctor can't get her in right now do to too many patience.. I've been giving her some cough syrup very very little of the kids kind and it doesn't seem to help.. every morning I give her a shower with me because it gets that bad her nose is stuffy also, but she doesn't start coughing until sleeping... help mommas I'm so tired...