The constant throat clearing was probably the first symptom that hit me years ago along with urinary/prostate problems.
I had luck clearing up the post nasal drip with apple cider vinegar and mega doses of ascorbic acid. Basically you need healthy acids to cut all that mucous in your throat up so it can drain out. Eating raw ginger should also help too. Also try garlic, turmeric, cayenne, and other such herbs.