been tested for cardiac problems i ER, nothing, I have cervical issues in past,{vertigo numb rt. fingers ,rt eye, shake} they are gone for years, now dull neck and shoulder pain,right side again, when walikng fast, neck and shoulder dull pain, then if i continue, pretty severe angina-like symptoms, and breathing hurts? However, I can do 50-75 crunches really fast ,then do 20-30 pushups, just a liitle out of breath,no issues? very confused?