Your symptoms suggest ?GASTRITIS ? CONSTIPATION ? IBS ETC. kindly discuss in details for proper guidance.
Loss of weight needs to be evaluated.
CONSTIPATION aggrevates all these problems so it has to be treated.
Next Steps
have plenty of fluids. avoid spicy foods coffee tea etc. avoid smoking, alcohol etc. healthy diet planning and lifestyle mater a lot. high fibre Diet. detailed planning of diet ACCORDINGLY.