Food giving me stomach cramps &running tummy

Since we came out late from church i decided to go and buy myself cooked food from spar malvern on the 17/7/2015 at 8:30, i bought the food( pap and beef stew) ate the food at around 00:00 am i awoke to terrible stomach cramps and running tummy as i sat on the toilet seat i began to feel dizzy and sweaty it literally became worse as i had to lay on the floor for 15 min. Its 9:18 am now and my stomach is still running. I am super mad right now,what do they put on their food as this is the second time i experience this after eating their food particularly the Malvern franchise?