Welcome to HealthcareMagic forum.
A sore throat
an mean an infection and this could either reach the ear or cause a referred pain
in the ear . The throat and the ear are connected and hence this is noticed .
It could be an infection of the throat most probably , or as the Doctor has examined you directly,it could be the arterial inflammation too.
If its an infection, salt warm saline water gargles three to four times a day is helpful, also rest your voice .A course of antibiotics may be needed if you have fever
and similar issues.
Follow oral hygiene
and use an anti ulcer gel for the sore,avoid harsh bristles tooth brush.
Wishing you good health .