The first step would be to determine the site of origin of the “severe bad smell.” The majority of such cases are on the basis of dental and/or nasal disease (often chronic infection with bacteria or a fungous), or non-infectious. The stomach can also be the source, especially if one has a hernia and/or what is called Gastric Reflux (flow of liquid from the stomach back into the esophagus.
My advice is that you first see your dentist to determine if the cause resides in your mouth, nose or throat.
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