Diahrea for a month? HELPPPP!! and yes i've been to the DR!?

Okay so I got sick with bechets around the 5th of Jan. Did a round of prednisone. Got sick with diahrea and nausea around the 10th of Jan. Broke down and went to the dr on the 21st of Jan. He took blood and said it was stomach flu and it would go away. Stayed sick called Dr around the 30th of Jan he prescribed donnatil. Got that filled. Went back on Feb 4th cus I was STILL sick! Prescribed Cipro. It is now the 10th and I'm still going like crazy... about 8-10 times a day. even when i don't eat that much. It's mainly liquid and looks like Stomach Acid..... How can I stop this??? I have a job interview tomorrow and I can't have stupid diahrea during it..