The symptoms that you are describing can be due to -
- prodrome of an illness or infection like flu, ear infection etc
- stress (physical or mental)
- other medical illnesses like hypothyroid, early diabetes etc
Since you are having these symptoms for 2 days, it seems more like an acute illness. You need to continue taking pain killers like ibuprofen, drink lots of fluids and rest. If you develop any cold or cough, then you can add an anti-histaminic like benadryl, do warm saline gargles and take steam.