Hi.
It is not normal to have a pain in stomach for such a long time and still you have not got investigations done.
The cause of pain in the abdomen for several months can be due to:
Intestinal obstruction, tuberculosis,
Irritable bowel syndrome, vascular problems and so on.
The cause of the severe sudden pain making you unable to walk must have been due to sudden obstruction or volvulus and the release of the obstruction giving you the feeling of liquid seeping inside stomach and down through your legs, this being a referred pain.
I would advise you the following:
Investigations:
*Routine blood investigations like Complete blood picture, blood sugar, urea, creatinine, liver function tests,
thyroid function tests.
*Urine -routine and microscopy
*Stool: routine, microscopy, occult blood, culture and sensitivity.
*
Ultrasonography of abdomen,
*Colonoscopy
*Enteroclysis
Once the diagnosis has been made, complete the medical or the
surgical treatment as may be advised by a Gastroenterologist.