You can detoxify your digestive system, which will help you get rid of the problems you are having with your mouth, throat, and voice. The first step is to change your diet, which includes avoiding processed and sugary foods. Include plenty of fruits and vegetables in your diet and also drink plenty of water. Check out http://www.ehow.com/how_6501074_clean-detox-digestive-system.html for details.
Eating foods with whole grains and fiber are very helpful. They help keep your colon clean which prevents polips and cysts that cause cancer AND a clean colon absorbs nutrients better. Giving you the full benefits of your food. Also avoid constipation by drinking lots of water. Getting backed up can be very uncomfortable and painful. At the first sign of constipation take Miralax.