Hello dear,
The symptoms as mentioned in your post can be attributed to accumulation of gas and excess acid formation in stomach.
Appearance of symptoms on drinking fizzy drinks is suggestive of the same.
Symptomatic relief can be obtained with intake of
Proton pump inhibitors like
Pantoprazole, which prevent acid formation in stomach (to be taken before meals)+
antacid gel (to be taken after meals).
And it is also needed that you take certain precautions regarding your diet & lifestyle, such as:
1. Take soft, plain, non-spicy foods
2. Drink lots of water to maintain adequate hydration
3. Avoid fast foods & gas producing food products like cabbage, etc.
4. Keep away
stress, think positive.
5. Exercise regularly & practice
meditation.
Wishing you a good health.
Take care.