Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain the symptoms of frequent passing of stools along with sore stomach and burning anus can be due to causes like viral gastroenteritis, food poisoning, parasitic infestation,food intolerance, food allergies,laxative abuse,excess intake of tea and coffee,electrolyte imbalance etc.. Burning sensation in anus seems to be due to irritation caused due to repeated bowel movements and will gradually subside once the loose motions will relieve... As of now you should start taking anti diarrhea medication like Loperaminde, take fluid replacement therapy that is drink plenty of oral rehydration salts by dissolving in water and take more of banana, yoghurt, rice and cereals.. Take Tylenol for pain.. In case if burning sensation in anus is severe then you can sit in a tub of warm water after bowels 2 to 3 times a day.. You can do cool compresses and also apply a steroid ointment.. In case of no resolution in next 3 to 4 days consult a Gastroenterologist and get evaluated and a thorough clinical evaluation and investigations like blood tests and stool culture can help in diagnosis and treatment can be done accordingly.. You can be advised antibiotics, Albendazole etc depending upon the cause diagnosed.. If it is due to food allergies the cause will be ruled out and eliminated from your diet.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora