Hi thanks for contacting HCM... You have nausea sometimes mostly at every two week.... So gastritis or ulcer can be primary cause. Take pentoprazole capsule for two week .. Empirical ciprofloxacin antibiotic taken for five days to clear infection if present. . Avoid gastric irritants like .... -excess tea , coffe -smoking -non veg food -alcohol etc ...... Fruits taken more . For few days avoid non veg and outside food. If still your complain increasing than investigate for h.pylori by urea breath test. ... USG also done ....for work up... Hope your concern solved .. Take care .... Advise : physician consultation ...