Sore Throat, 4 months old.

My baby throat is sore, when to consult doctor and given a throar drops and the dosage is for 3x a day. It seems by night she when to bed the effect wore off already n whenever she get up for milk, she tried to drink but she cried when she tried to swallow. Wonder if there is a way to ease her pain other than docs medicine? Hurts to see her hungry but cant drink her milk.