I Had Foot Surgery On July 31st . Five Days

I had foot surgery on July 31st . Five days later I started having diarrhea. I called my doctor.I was told it was a virus. I waited 3 to 4 weeks and went into see her. Blood was taken and a stool sample. The tests came out okay. I still had diarrhea so I was treated with Azithromycin (Z-Pak}. I had to have more stool testing. I came up positive for Lactoferrin. I was put on a bland diet. Seven years ago I had Stage 3 colon cancer.My last colonoscopy was on April 6,2018. The test came out clean. I am very concerned.