I traveled from Japan to India 10 days ago. For the past 1 week i am having occasional stomach ache (middle and lower region) sometimes followed by loose motions(1-2 times a day). In the initial days I had weakness and little nausea also. I changed my drinking water from tap to bisleri and eat only curd, roti, banana, dal and rice. The problem has reduced but still exists. I also had little sore throat now it reduced but have little coughing at night. NO FEVER. please help.