Re: Can post nasal drip cause a burning stomach
The symptoms you describe are classic LPR (Laryngopharyngeal Reflux) symptoms and Titchou is right that it can take 3 months to see an improvement.
In addition to the medication, there are several lifestyle changes that you can make to help the medications work more quickly. If possible, avoid trigger foods (alcohol, chocolate, peppermint, tomato-based foods, coffee and other caffeinated beverages), don't eat anything for 3 hours before lying down and raise the head of your bed 6 inches (sleeping propped up with pillows will not help).
It's likely that the post-nasal drip is a symptom of the acid reflux but you might try taking an antihistamine to see if helps alleviate some of the PND.