I'm a little confused about this med. I told the dr. that when I have a loose day (D) I get nausea and some aching across the belly (either right or left or across the umbilical area). He said to take a Bentyl tablet every morning. It does help. My IBS alternates from C to normal to D. Do you use this med only when needed or will it help keep my days normal if I used it all the time?