If he seems happy & is feeding ok, then he should be ok.
If he feels warm, starts refusing feeds, or just seems irritable I'd get him checked out. They would more than likely be the things that showed a sore throat or ear ache. They refuse feeds as swallowing hurts so much with either an ear ache or a sore throat.
If his snot is green that is usually indication of an infection as well, & usually best to get checked.