please help my son has horrible diarrea and he throws up after he eats or during eating I don't know…

please help my son has horrible diarrea and he throws up after he eats or during eating I don't know why it's been like this for about what weeks or so I haven't tooken him to the clinc because over the phone they say it could be a stomach bug. any good home remedies that can help he is 1 years old