Hi.
Thanks for your query and elucidate history.
All your symptoms are suggestive of
Gastroenteritis with its complication like bloating to the tune of 8 months
pregnancy, hardness and pain in the upper abdomen and so on.
I would suggest you the following:
Go for basic investigations of blood, urine, stool, X-ray of the abdomen in standing position and
ultrasonography.
Get started with proper antibiotic,
metronidazole, pre and probiotics, activated charcoal tablets and symptomatic treatment.
If there is complete relief, well and good. If incomplete relief then you have to undergo for further investigations and management:
Liver function tests
Upper GI endoscopy
Colonoscopy
CT scan of the abdomen
Opinion of a Gastroenterologist/
General Surgeon for clinical evaluation, examination and further treatment.