Flu

My baby is 2 months old now and she is having flu and little cough. I can hear her phlegm sound when she breath. Consulted dr, streeimar and nose drop Otrivin given. Otrivin to be use for 1 week only. After she’s still having flu. I am applying Vick’s and baby herbal cream on her chest and feed but the flu still not Going away and she’s really struggling. Shall I continue this Vick’s Method or bring her to consult dr again? I worry if it leads to serious condition! I’ll be starting work next month and hope she will recover soon. Also, can I give her frozen EBM? Will this cause her more flu? Her flu was getting better , I was out and given frozen EBM which been thawed and warmed. Realised that flu is back !!! She did not poop for 2 days... it’s normal?