Hi.
The pain which worsens on walking, radiating to the back, with reflux and
indigestion is suggestive of an inflammatory process going on in the abdomen. The mucus and
flatulence, loose stools can be a sequel. Such type of symptoms can be due to
gastroenteritis / colitis of various reasons.
I would advise you to undergo the following tests:
Blood- complete blood picture, kidney functions tests, blood sugar fasting and post-lunch,
Urine- routine,microscopy, culture and sensitivity ( before start of antibiotic)
Ultrasonography of abdomen.
Take a course of an antibiotic,
metronidazole, probiotic and other supportive medicines as may be suggested by your treating Doctor.
This should help you get alright.