I Am A Healthy 55yo Female. I Only Take 10mg

I am a healthy 55yo female. I only take 10mg of Norvasc daily. For 2 weeks I have had urgent mucus diarrhea. I also am having chills and low back pain. Imodium helps but once I stop the diarrhea comes back. I have not taken any antibiotics in the last year. I work as an OR nurse and this is very troublesome at work.