Sore throat lingering after cold

I have a sore throat that is quite annoying. For about the last two weeks I have been getting a sore throat every night. Before noon the next day it stops hurting, but by the evening it starts hurting again. I've tried drinking warm beverages at night, gargling salt water, and lazenges, and nothing seems to really help. I had a small cold (runny nose and sore throat) a few weeks back but got over it. This sore throat came about a week or more after the cold.