Another idea is to go to an Ear, Nose, and Throat doctor (ENT). This speciaIist might have some additional ideas and tests to run, such as putting a scope down your throat to see what it looks like.
Don't give up! Be your own advocate to keep pressing until ou get an answer.
some type of heart attacks do that I don't know whether you should take ECG or Eco. was enough.
CT and Xray should rule out Thoracic aortic aneurysm. maybe the best option would be having CT with contrast, I don't know you should ask a specialist.
check your Blood Pressure over a few weeks.
a possible cause of cough and neck pain could be Mold infection, you could try a week of anti-fungal like Itraconazole.
if you haven't been see Cardiologist and Pneumologist.