Hello,
Post-nasal drip (PND) occurs when excessive mucus is produced by the sinuses. The excess mucus accumulates in the throat or back of the nose. It can be caused by rhinitis, sinusitis, or laryngopharyngeal acid reflux. It can be enhanced or sometimes even caused by allergies.
Please check out with an ENT specialist if you are having chronic rhinitis or sinusitis. If you have chronic sinusitis then it can lead to continuous production of mucus and less drainage leading to post nasal drip. Transillumination test and X-Ray or CT sinuses can help in diagnosing it. If allergic rhinitis is the cause of PND then it can be diagnosed by skin ***** tests or blood tests like RAST.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
Take large doses of vitamin B5 (a natural mucus thinner) and see if that works. Also there are yoga breathing exercises that have helped me greatly.