How can I improve the feeling of swelling in the upper abdomen?

It's not always like that, and it's not even when I overeat.

About 1 to 2 hours after finishing a meal, if I eat other food before digestion is complete, I feel bloated in my stomach once every two or three times, and the symptoms seem to last for about 3 to 4 days. During such times, I don't feel hungry at all even if I don't eat anything all day. Taking digestive medicine doesn't seem to help, and I often feel very exhausted every time this happens. ㅜㅜ

I wonder if I should at least take traditional medicine.