I am 32 years old (6 feet, 208 pounds) and I have been experiencing upper chest / throat tightness & lightheadedness every day since 12/15/10 ... Driving me crazy. I can breathe normally. I've never had a fever, no aches, no pains, no injuries. I have had 2 EKG's, a brain MRI/MRA, a brain CT scan, chest xray, blood tests, stress test, thyroid test, & my blood pressure checked on the regular. All of these tests came back OK.