"Normal" blood test but im still having server symptoms why?

I have been throwing up, or i havent be able to eat nor drink, yet somehow my blood tests keep coming back somewhat normal. But im losing 2-3 pounds a day, in constant pain below my ribs, extreme bloating. I do have fibro, ibs, barrets esphogas, diagnosed. I may have a gastroparesis and heart condition diagnoses in my future but im so confused on why my blood work is "normal", there are some things that are about to be low or high but my doctors still say its normal and its taken almost 2 years to get this far. I feel like im going crazy but i know something isnt right with my symptoms. Please help 🥺