From the details produced,i suspect the problems and difficulties are associated with wisdom tooth impaction
which is inflammed.
Get a thorough clinical examination by a dentist
Impacted teeth has to be extracted or flap overlying tooth has to be removed to enhance tooth eruption.
If symptoms perists,please do visit an ENT specialist
Meanwhile,maintain oral hygiene well.
Take fluids as well as nutritious diet.
Vitamin becosules,iron supplements
has to be administered..