Hello
To opine I would require full
LFT. Possibilities could be - Gilbert's syndome (which is common and innocuous),
Vitamin B12 defeciency or mild hemolytic anemia ( in view of splenomegaly). I would suggest - LFT/PT/CBC/Peripheral smaer examination/HBsAg/HCV/Vitamin B12 assay/USG abdomen. For acidity you can start with PPI like rabeprazole.