Don't get nervous. Most probably you are suffering form GERD, that is a gastric disorder.
Next Steps
take tab pan-d 1 tab in the early morning in empty stomach for 15 days. clean your tongue, do salt-hot water mouthwash, apply candid mouthpaint on your tongue, brush your teeth twice daily with proper method. if don't resolved reffer to MD(medicine) or gastroenterologist for further consultation.