Hi thanks for asking question. Noted you have only fluttering sensation. Do you have diarrhea? Or increased stool frequency? Is there excess mucus in stool?? If above present then here possibility of simple colitis is there. Antibiotic like oflixacin and ornidazole combination given for few days. CBC done. Here also possibility of non specific colitis might be there.Endoscopy and subsequent biopsy can taken for it. Meanwhile if you developed abdominal pain and vomiting appendicitis ruled out by USG. So you have to first take antibiotic and good diet .If progressive then USG or colonoscopy can be done. Meanwhile drink more water. -Cooked oatmeal good. -Green leafy veg useful -garlic with honey good herbal remedy -if spasm is more then antispasmodic can given -avoid cabbage, cauliflower like gas forming food. I still cause not clear then it might simple muscular strain induced spasm. Wish you good health. Dr.parth