You go for exercises regularly. That's why you have so much strength that you can initiate a burping by putting pressure on your abdomen. Please continue with that. You have mastered the treatment.

Use rabeprazole 20mg twice before food for 3 days

Kindly consult me so that we could plan the further course of management.

Can help you, kindly provide detailed history for proper diagnosis and further management

On the basis of your sign and symptom you have gastritis problem. As you have said you  do exercise regularly and take water then you should attention to change your diet plan - 1- take less spicy and fatty food 2- take less in take of food . 3- avoid sugar and it's byproduct. If again these symptom come then take consultation from a doctor to make correct diagnosis and start right treatment.

Avoid sleeping after food.Do walking and exercise regularly.Eat Salad leafy vegetables regularly,drink water as required.This will help for gas problem.

Tab pand 30 min before to breakfast and dinner for five days