Hello Doctor, I have been having this pain in my throat for the past three days and it hurts eveyr time I swallow, or open my mouth to chew food or when I yawn. On the first day it was like the usual pain when I get a throat infection but today being the third day, it hurts exactly on the left tonsil. Also, I have cold and the phlegm is of rust color in the morning when I brush and yellow during the day. Kindly advice. Thank you.