Violette, adding more natural food fiber to your diet will likely help.
More oatmeal, bran, apples, bananas, beans, whole grain bread....
You might want to look into psyllium husk fiber supplements as well (made from the psyllium grain). Psyllium is the main ingredient in Metamusil. It tends to help correct both constipation and diarrhea. It helps normalize you if you eat a diet too low in fiber, which many people do. Too low fiber causes constipation, and many people with constipation wind up with hemorrhoids. It often begins to be a problem during pregnancy and right after.

You should read up online on the causes of hemorhoids, as opposed to just treating the symptoms. Good luck!