Brief Answer:
Investigations and clinical examination

Detailed Answer:
Hi.
Thanks for your query.

I have read your history, it looks you want to know the reasons for indigestion, feeling of bloating and pain in abdomen even on touching.

I would like to know some details for me to assist in understanding the reasons of the problems you have mentioned.
Are there more symptoms like nausea / vomiting / fever/ change in bowel habits like loose motions or mucus in stool ?
Since when have you got this problem ?
Any specific past history related to general disease like diabetes or typhoid ?

The most probable causes of indigestion, bloating and tender abdomen are as follows ::
Gastroenteritis.
Pancreatitis.
Allergy to certain foods and beverages.
Anxiety, stress - have direct bearing on G I tract.
Abdominal specific disorders like- tuberculosis although may be rare in your area.
Sub-acute intestinal obstruction.

I would advise you the following:
- First of all- a clinical/ physical examination of the abdomen by a Gastroenterologist / General Surgeon is very important as this helps in correlation between the history, symptoms, signs, investigations ans response to the treatment, follow-up and further management.
-X-ray of the abdomen in Standing position
-Ultrasonography and CT scan of the abdomen. Helps in diagnosis of many causes.
-Blood tests: CBC, ESR, blood sugar, liver function tests, kidney function tests, thyroid function tests, amylase, lipase ( pancreatic enzymes), Widal for Typhoid and other tests as may be needed as per history and clinical examination.
-Urine : routine and microscopy.
-Stool : routine, microscopy, occult blood.

All these investigations collectively can give a proper diagnosis and gives plan for the best possible treatment.

By the time you get all these things done you can take activated Charcoal tablets, Pre and probiotic, Pancreatic enzyme preparations to be taken with food. Avoid all the foods and beverages you must have noticed to start or increase the problem.

Take a course of antibiotic, metronidazole for 5 days, may help a lot.
I hope this answer helps you solve your problem. Please feel free to ask for more information if you need to and please give feedback.

Wising you a good health.

---