HI I have gone through your mail and as you said that you are worried for your bad breath
you have used throat gargling etc but you are not sure that from where this is coming (nose or reflex from abdomen). After considering your complaints I would like to tell you that basically you are having sinusitis
which is responsible for post nasal drip
which is giving bad breath.thus you should contact your E.N.T.specialist for physical examination and clinical co-relation of symptoms and treatment.Thanks.