Mucus in nose and chest. cant breathe.

My son Divith 2 years 2 months. Weight 14 kg.  He had fever 99.6 . My family members have fever, cough, cold. I am giving ibuprofen and paracetamol suspension ibugesic plus 5 ml  every 6 hours. Fever is decreasing and increasing My problem is night he got nose block and chest congestion i feel. He was coughing too. Suddenly he got up felt like vomiting but couldn't at the same time couldnt breathe. It was scary for us. We tapped his back to prevent if anything choking him. Then after long timr after lifting and putting him in shoulder he was better But still looks like he has mucus . We gave mucolite 5 ml as old doctor prescription. Plus otrivin nasal 1 drop each side. My question is what to do if suddenly kid cant breathe due to mucus. As i said. Doing like vomiting. But cant vomit nor breathe what to do?? Hospital is 30 min away. What immediate we can do to help him breathe??? I have got chest congestion for five times now already. Doctor gave me rotahaler