To code level 3, you must have 2 of 3 of problem, data and risk be low level.
Problem - you are stating it is low for an acute, uncomplicated illness. Keep in mind, depending on the particular severity of the problem and what else is going on, sore throat or pharyngitis might be considered straightforward for a minor problem, low for acute, uncomplicated illness, or moderate for acute illness with systemic symptoms.
Data - 1 test ordered/reviewed is straightforward.
Risk - you are not stating at all what the treatment plan is. Gargle with salt water - straightforward. Take Nyquil Q 4h - low. Prescription decision - moderate. Does the patient have underlying health conditions that are altering the treatment plan?
Each visit should be leveled on the documentation provided for that specific visit.