Our expert says:
This is indeed a difficult problem to solve, as coughing can obviously have many causes. You know by now which of the past treatments have made any difference, so I suggest you make a short list before you see your ENT. Ask for another opinion, or go to your ENT if you are able to comfortably explain your situation. Generally, possible causes include the following:
1. Gastro-oesophageal relux disease (causing heartburn, and drying the back of your throat).
2. Chronic sinusitis (post nasal drip, causing chronic irritation)
3. Medication (ie. certain bloodpressure tablets/ asthmatic pumps)
4. Allergies (as you may have, but spesifically for certain foodstuffs)
5. Environmental factors (air conditioning, etc)
6. A primary chest problem
7. A growth in your throat (highly unlikely due to the long history)
It is indeed possible that the sulpha's may be the cause, it should work out quite quickly, so I think the one month trial is a very good suggestion. If your ENT can not find a cause, you may benefit from a physician's or pulmonologist's opinion.
The ear canal is supplied by nerves that also supply the throat, so any irritation tothe earcanal may trigger a bout of coughing.
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