Why do I feel discomfort in stomach?

It’s kid a bloated sometimes get discomfort after I drink my vanilla ensure drink, it’s so yummy but I don't know y makes me get discomfort. Sometimes I get random pains, now on left lower side felt tight heavy feeling not sure if it’s how I was sitting on bed crooked. I also have gastritis. And lately not been craving food like not super hungry.
Why do I feel discomfort in stomach?
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