Bad wheezing cough

My 5 month old son has bad cough since 15 february 2021. When to A&E, his lung swollen and he is wheezing. He has lots of phlegm at throat which cause him to have red throat and sore throat. He lose weight due to ever 3 hrs he didnt finish up his milk. Doctor prescribe him inhaler with salbuair inhaler with spacer and mouthpiece. He dont have asthma. But I dont want to make him took mefication since he yoo young. What should I do to help me recover?#advicepls #1stimemom