Post viral fever chronic wet cough. Now.

Hi respected doctors I need advice . My baby is 20 month old approx 11 kg weight My baby got viral fever on 30 September temp 102+ for continuos 3 days till then we gave him crocin drops and. went after 3 days because cough persists it was dry cough initially . So he gave chericoff ls syrup A multivitamin drop Deflazacort syrup and suggested nebuliser with budesal capsule. So we give continuos for 5 days twice. But as now his cough become chronic wet . So he suggested some antibiotic injection. And we are giving him injection And as of now I stopped cough syrup only giving injection. But cough is not reducing . Not whole day he cough .he cough 8-10 time a day but sound feels like that I think I put hand inside mouth to bring out all mucus. So pls suggest what to do now. In this time period of 10 days he became obstinate keep crying and appetite isvery less . What to do now.