hi this is dr.subhadeep.thanks for the opportunity to help you.from your description it is not very clear cut still I will try to help you.
your age is 30 years very young and unlikely age for cancer.
you haven't elaborated any other symptom other than nausea like
weight loss within 4 years,wether you felt any mass abdomen, weather you r having any reflux of food vomitting,
blood in stool etc.
please don't mind but please can you let me know weather your periods r regular or not.
in the absence of all the other mentioned symptoms I can only think of
chronic gastritis and those white lines can be due to fibrosis of the pylorus of the stomach.malignancy is a rare possibility.kindly elaborate your USG report.
USG is always not significant as it is observer dependent so a CECT and UGI scopy will be ideal for diagnosis.
if suppose your kidney functions r not normal or if you r having
amenorrhea an MRI abdomen will be a safer choice. kindly get back to me with a CECT/MRI abdomen report.
hope the consultation was beneficial.
for your nausea you can use a combination of tab pantopazol+t.
domperidone combination BD before food.
let me know if the consultation was beneficial
regards