What Causes Frequent Bowel Movements With Sticky Stools?

For about 3-4 months my bm have changed from normal to a range of lose colors, sticky. I don't eat many fried or processed foods or GMO foods. We try and eat organically. Even with adding more veggies in nothing has changed. I don't take any medications at all. The only problem is when I have to go, I have to go. There is almost no grace time to wait. When I do go it's fast and furious and even when I'm done it doesn't always feel that way. I have an appontment Monday to see my dr but any ideas? Mosy very dark very sticky and rarely formed.