Hi Arabinda, I understand your concern. Ornidazole and Ofloxin tablet are antibiotics used to treat gut infection. I believe you had diarrhea along with slight fever when going through stomach flu. Now, the problems you are having now with constipation, not properly formed stool and sleeping problems are not related to stomach flu. Stool examination and culture are recommended to determine the right diagnosis. Abdominal ultrasound is also recommended. Until you see your doctor and run the advised tests, I advise to: - increase fluids intake - take foods rich in fiber; fiber supplements containing prunes and psyllium can help - take probiotics to stabilize intestinal flora Hope this helps.