Hi,
Most likely cause of such symptoms is viral gastroenteritis but in few cases bacterial infection can also cause gastroenteritis .
In cases of acute diarrhoea it would be wise to drink more fluids (3-4 litres a day), preferably containing sugar and salts. Ready-mixed rehydration sachets (eg Rehidrat) can be bought from the pharmacist and added to drinking water.
Eat something containing salt, such as crisps or soup.
Maintain good standards of hygiene.
Eat normally as soon as your appetite returns but if you have suffered an acute attack of diarrhoea, avoid foods containing milk for a couple of days.
Source - http://www.netdoctor.co.uk/diseases/facts/diarrhoea.htm
Usually anti spasmodic medicine like hyoscine butylbromide ( Buscopan) are required to treat the abdominal pain apart from anti emmetic like domperidone ...
Usually viral gastroenteritis is self limiting and symptoms are very likely to settle down within a week and further tests are usually unnecessary.Also care must be taken not to loose enough fluid as dehydration is the major complication of diarrhoea .
Check this link
http://www.nhsdirect.nhs.uk/articles/article.aspx?articleId=131§ionId=11
OTC pepto bismol can be taken to treat vomiting ,diarrhoea .
The treatment is usually symptomatic and main aim is to prevent dehydration .
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