Why Is My Upper Abdomen Always Bloated And Have Gas
It could be malabsorption or metabolic disease
What you describe can be many things, e.g. malabsorption such as lactose intolerance, celiac disease, Whipples disease, or a metabolic disorder, e.g. hyperthyroidism.
I suggest you schedule for blood tests (metabolic panel, hemoglobin, autoantibodies for example for celiac disease, TRAB antibodies), a gastroscopy with biopsies, and fecal tests for parasites, elastasis, bacteria, and calprotectin.
Hope this helps. Please let me know if there is anything else I can help you with.