Suddenly it started to hurt to swallow on right side, had become more painful after day 2. no cold symptoms. no wisdom tooth has broken through gum?

Wisdom Tooth: Could be an impacted wisdom tooth. You don't need to be able to see it for the tooth to be problematic. See a local dentist for an evaluation.

Where?: If your throat hurts, see your Physician. May be the start of a viral or bacterial infection. If your gums hurt directly behind your last tooth, you may have an impacted wisdom tooth doing damage. See your Dentist.