Cough, cold& congested nose

Hi doc , My 6 month old daughter is suffering from cold , cough and congested nose . Her cough is bad that she has reduced taking solids at all and she cries after coughing (So I guess it is painful for her ) .Her nose is also blocked that now and then I can hear her breathe through the blockage and she wakes up crying unable to breathe . I have gone to a peadiatrician and he has given medicines but still there is no improvement .it's almost 4 days and the only improvement is that her sneezing cold has now become cold with cough . Is there any home remedies that I can follow to help her with the blocked nose and painful throat ? Like can show a little bit of the smell of eucalyptus oil ? Something like that ? And for her throat wat else can I do ? And also pls tel me if we can use nasal aspirator?. Please help this helpless mother ... Thanks in advance