Itchy throat is likely symptoms of allergy. Like nasal itch in nasal allergy. So the treatment is basically avoiding known allergens.
Next Steps
If persistence after home remedies consult ENT specialist online or in a nearby clinic
Health Tips
1. Avoid allergens
2. Start warm saline gargles
3. Avoid sour foods
4. Tablet
Vitamin C - 1 tab daily
5. Avoid cold food items