The pain in cheek is because of your erupting or partially erupted wisdom tooth. This situation is called pericoronitis which causes swelling and infection to spread in your cheeks, neck and radiating pain all over ur head. Visit an oral and maxillofacial surgeon for problem of wisdom tooth. If you are in Bangalore you can consult with me.

The reason of pain and swelling could be the wisdom tooth,,so see a dentist and get the tooth removed asap,,avoid hot fomentation from outside the cheek,,avoid chewing from affected side.