Stop treating the symptoms, treat the cause. You're very likely to be constipated because you lack good flora and healthy bile flow. Get rid of candida and parasites, and cleanse your liver. For the candida and parasites in the colon, nothing has worked better for me than milk kefir retention enemas. For those in the small intestine, drink milk kefir, take raw garlic, turmeric or Black-Walnut tincture. To cleanse your liver, consider liver flushing, coffee enemas, and beet juice. You should get yourself on a healthy Diet too.
edit: don't be affraid of getting addicted to enemas, especially if you don't feel well during the cleansing process. At some point, and for many monthes, I was taking up to 4 high enemas daily (!), and had to stop suddenly. The next day I was going to the loo twice a day on a low fiber diet.