I have post nasal drip for over a year. I also have tightness in my chest and throat. I went for a stress test because I have heart murmur and a problem with the valves do not close. I am also taking medication for hyperthyroidism. My thyroid is under controlled by medication. I do not need medication for heart condition. I am taking Zantac for GERD, but I do not feel better. The tightness in my chest and throat do not go away. I took a test for allergy, but I do not have allergy. If I do not have allergy, how come I still have post nasal drip? Am I being wrongly diagnosed? Please help!