dark yellow snot & not sleeping well? sick 9 month old

xoxo

My baby is almost 9 months old and has had bad congestion for a week now. We saw a doctor awhile ago but they said it was probably just a cold. Now her behavior has changed though as shes getting up throughout the night and is super squirmy in her sleep. I plan on taking her to the doctors again tomorrow, but would like to hear some advice.