Hello and welcome to e health forum.
The description of your symptoms, point to a possibility of upper respiratory tract infection associated with sinusitis and or pharyngitis.
Since the symptoms have been persistent for a long duration, you may need proper treatment with antibiotics and supportive medications to help relieve your symptoms.
For the mean time, taking OTC medications like Advil or Motrin might be very helpful to reduce the pain and inflammation associated with your symptoms.
You might seek your doctors advice for a prescription of appropriate antibiotics.