dear user these symptoms of diarrhea and abdominal cramps refer to viral or bacterial infection of your intestine.... infection of the intestine has many causes according to history of begining of symptoms the cause almost detected.....it was good from you to do blood test but the most important test in this case is stool culture test ...stool culture is very effective to detect type of infection as you may get infected with amoeba or salmonnela typhi or shigella or compylobacter bacteria ... that could be managed with antibacterial drugs to get out your worry.... the first step of investigations is to know the causative organism as the most common cause of these symptoms is salmonella that cause typhoid disease.... you shouldnot be stressed of these symptoms as stress will impair your immunity and cause symptoms to get worse.... you should administer plenty of fluids and rice soup and tea with little suger that helps improvement and do stool culture to detect cause and treatment begin simply......dont forget that anxiety and stress can cause these symptoms as it affect smooth muscle of intestine ........ wish you healthy life