hi,thanks for query,at your age the symptoms favors approaching menopause
.Still your symptoms are more related to G.I.Tract,so first of all you should get an ultrasound
of abdomen done to rule out possibility of gall stones
.Then after wards speak to your doctor about this and get your self examined.Take light diet and frequent small meals,avoid fasting and skipping meals,drink more liquids and do some light exercise every day.
wishing you good health.