Simple equations.

Eva's stomach+Eva's HCL+Food= Vomit blood

Eva's stomach+Eva's HCL+ Water only= Gas

Eva's stomach+ Eva's HCL + Liquid food =Gas+vomit

Eva's Stomach + Eva's HCL= HUNGER+Bubz not getting nutrients+gas+gastric

X= No vomit+ No gas+ bubz getting nutrients

Find X.