really appreciate the information, thanks so much,,wish i lived in colorado,,I am planning to see a orthopedic, doctor, very strange symptoms,feel great, i can do lots of crunches and push-ups,exercise , no issues,,BUT fast walking ,maybe 500-600 ft, rt. side neck dull pain, then inside throat,then feels like top of lungs, and I have to stop, breathing gets painfull , will cervical angina cause this? ,,,been in great shape ,my whole life never smoked, barely drink alcohol,same weight, since highschool, 50 years of doing construction, always had incredible endurance ,, but now??whats up?