Hello, i am your doctor. Continuous throat pain with congestion for more than 3 months are common in metro cities. As your blood report is normal it is least likely a infective cause.
Next Steps
Daily gargle with warm saline water in morning for 5 days, take good sleep, have nutritious diet, avoid junk food.
Health Tips
Avoid long exposure to polluted areas, have mask or hander kerchief in congested polluted areas. Have a good day.