Cold cough wheezing from past 3 weeks.

My lo is 7 days shy of turning 3m. He is suffering from cold, cough and wheezing from past 3 weeks and pead has initially prescribed wikoryl 0.5 ml 3 times, kufril L S 0.5 ml 3 times, even after which cold and cough didn't reduce then doc prescribed alaspan 2.5ml (only at night), welminic 1 ml, wikoryl 3 times each and duolin 1ml + 1ml saline water nebulization with which there was slight improvement in wheezing and cough but the doc again changed the medicine to deriphyllin syrup 2 ml 3 times and omnocotil 2 times a day along with nebulization. There was no weight gain during this span plus breastmilk intake got considerably reduced. Now he has goopy eyes also due to infection.. we need a second opinion regarding the medications and treatment.. kindly help.