Slight fever and slight cough

Patient: Hi..i’d cold and cough since 2 months i went to doc get treated for that and i gotta cured. after that i got afternoon time fever it’s exact not like fever it’s kinda like burn start from chest and completely spread on my’s appeared like an again i went doctor he checked me with blood test.. so finally get low immunity…so he prescribed lupizyme syrup with b-protein and then renerv plus with cold syrup,then cheston cold pills…after that i gotta recovered..when he said cheston cold for week and renerv plus for 15 days..i did that but still now i got slight fever and cough get stopped..what should i do for that..kindly guideThank you