Michviv,
thanks for asking. in the end, we brought him to kkh in the evening after pressure from both grannies. the doc there didn't even want to see his poo or his swollen butt, just told us that it is common for him to poo for 5 to 7 days, as long as he is not dehydrated (still drinking, can pee, tongue not dry, etc) shld be ok, but if he is vomitting, then he shld be admitted. She gave us some cream for the butt and pedialyte pops (i didn't managed to get this from pharmacy) and sent us home. And she said it might not be Salmonella, could be just viral.
From last night till morning, he is still poo-ing...wonder when will it last. My PD did not test G's poo cos we went on Sunday and she mentioned the lab is closed. She said it's Salmonella cos' she saw and smelt the poo (it was stinky and slimey). Nope, so far G didn't have fever, cross fingers and toes.