you are suffering from esophagitis
due to GERD.your sore throat
is due to acid is coming from stromach into your throat and irritating him.In order to get off from symptoms of heart burn you should start is life style modification means use a healthy diet avoid tea coffee drinks spicy and fry foods.You should use milk and yogurt as they suppress the acid and gave you relief and use pillow while sleeping and never lay down after eating mostly after dinner and must eat at least 2 hours before going into bed and not wear tight clothes try this it will help.
If still persist use some antacid
preparations such as syrup GAVISCON
ADVANCE or histamine2-receptor antagonists, histamine2-receptor antagonists such as Tab Zantac
150mg or Cap Nexum 20mg any one of these and must be taken before meal at least half hour also you need Prokinetic agents which work by increasing the ability of the stomach to empty like tab Motillium.