hi.. you have loss of appetite and nausea
vomitting yellow bile..
you could be having jaundice
/acid peptic disease
see your physician and get CBC and LFT done...if the reports are normal, start with antacids, and stay away from the smoking/alcohol, reduce spicy food and stress
if LFT reports are abnormal, then you may have to undergo further investigation to know the cause for hepatitis/jaundice..see your physician for this.
wish you good health..