As per your statement, what you are having is inflammation of colon, due to various causes.
Weakness and cramps are due to electrolyte deficiency
. You need IV fluids, and treatment for colitis
after macro and microscopic examination of stools. You need relevant antibiotic anti amoebic and if necessary tab to reduce your intestinal motility due to irritation (Like irritable bowel syndrome
). Already you have delayed for 15 days. consult your dr immediately and follow his treatment and diet. Don't delay further.