Girls, hello ? We need your help, our baby is almost 2 months old an…

Girls, hello ? We need your help, our baby is almost 2 months old and has a cough and terrible phlegm, he lost his voice because of this (the mucus gets into his throat with these oils, he can't spit it out ( they come out but with vomiting like a fountain I already started worrying that he's going to be ripped out) How to get rid of it completely? The baby is so restless, I don't know what to do. I was at the doctor, they prescribed an inhaler and drainage massage, but I don't see any results. Has anyone had this experience? Please tell me what you used to save him ?