Bad smelling gas indicates that something is fermenting and or rotting in your intestines. If you are constipated, that is the reason. Are you taking p b& c shakes? If not why are you constipated? Are you eating the right foods, drinking enough water, doing an enema( everyday if need be), and taking an herbal laxative such as Senne ( Senokot is very good)
Your digestion is slowed and backed up. These are prime conditions for candida and you cannot allow yourself to become constipated.