Thanks for contacting healthcare magic... According to your complain you have problem of frequent diarrhoea and abdominal cramps that may be because of ulcerative colitis. Bloody diarrhoea seen in ulcerative colitis. If abdominal problems more than there is chanses of overgrown of bacteria. Proper antibiotics course start under doctor s suggestion. Stool sample test is helpful to detect Infection. Do some diet and lifestyle modifications like avoid fatty foods and limit a dairy product. Take low fatty foods.Take high fiber foods like whole grains, fruits..etc. Avoid spicy foods, caffeine and alcohol drinking. Avoid foods like cabbage, cauliflower, corns,beans,seeds...etc Take multivitamin supplement. Drink more water per day.. After taking this much care still symptoms are present than consent a gastroenterologist for further diagnosis. I hope my guidance is helpful to you.. Take care. Thank you.