Severe heel and joint pain with a high fever may indicate joint inflammation or infection. Resting the feet, avoiding excessive walking, and staying well hydrated may help reduce discomfort. Monitoring the fever and general condition is also important. Consult a doctor immediately for proper examination and suitable treatment.

If pain persists, you may need proper evaluation by a dentist and possibly a change of medicines. Meanwhile, do warm salt-water rinses 3 to 4 times daily and maintain good oral hygiene until definitive treatment is possible.