HI
Thanks for posting your query to Healthcaremagic.
It's infection of the gut . Infection could be due to virus or bacteria but in your case I strongly feel its due to bacteria.
I would recommend the following tests for you , kindly get this tests done and revert back .
Complete Hemogram , Serum Electrolytes ,
Serum Creatinine, Stool Routine , Stool for hanging drop preparation , Stool culture sensitivity tests.
Till you get the reports drink plenty of water , fruit juices and avoid dairy food , avoid oily food and avoid non veg food also.
Its preferable if you could get a prescription of Antibiotic from your doctor till you get the reports.
Hope this information was useful to you.
Any clarifications feel free to ask .
Regards.