You should first rule out pregnancy
. You can repeat a urine pregnancy test.
You can get your HCG
levels tested and can get an ultrasound
abdomen and pelvis also.
If there are no indications of pregnancy of any type (including ectopic), you could concentrate on your acidity and flatulence
problem and can get treated for that.(heart burn and noises).
Later can consult a gynecologist for regularization of periods.
Hope this answer helps you.. Take care