Welcome to JustAnswer Health...and thank you for your question. I am a verified Expert and am delighted to help you today. You may have something called Irritable bowel syndrome( IBS) IBS is a term given to A FUNCTIONAL BOWEL DISORDER THAT CAUSES ALTERNATING DIARRHEA AND CONSTIPATION, ABDOMINAL discomfort AND BLOATING. Try this, drink least 8 glasses of water per day. Purchase Bio- K ( available in the cold case of health food stores) , which is an excellent probiotic that will not only help with regularity but also improve your immune system, also purchase Benefiber..( Over the counter) and take it per package directions. This combined with Bio K will promote regular, productive, well formed, easy to pass stools and help eliminate abdominal discomfort. As for the post nasal drip...
this is often caused by allergies, particularly dust. For some people this is manifested in bed time post nasal drip. A good investment would be an air purifier for your bedroom, this makes a world of difference for many people. This is the one I personally use and I can verify that it has helped me tremendously with nasal problems at night. http://www.austinair.com/allergymachine.php It will work within hours and you should see a measurable improvement on the very first night:-)
I hope this informationhelps, plese let me know if I can help you further:-)