You have acid peptic disease.
Why are you talking multivitamins whithout any reason. ( You must be alergic to some contents of the medicine).
You need life style modification with some medicines.
Next Steps
consult me if possible for you
Health Tips
Avoid spicy and oily food.
Drink plenty of water. 4 liters per day.
Don't over eat.
Don't eat and lie down keep atleast 2 hours of gap.
Add probiotics to your diet.