Chest pain and risk of coronary artery disease, Prinzmetal's angina

I have been experiencing chest pain for several years. Went to the ER in 2006 with this pain. They admitted me because my EKG was abnormal but said that enzymes were normal. They first told me I was having an acute heart attack before doing the tests. Had a heart cath and it was negative for blockage. When I received copies of the hospital reports it was indicated that I had Angina. They didn't put me on any meds for that. I have had recurring pain since then. It usually starts in my right jaw, radiates to the neck and then to the chest and arm. I recently had another stress test, pulmonary function test and chest xrays. Still, no indication of heart problems except for the angina. This pain happens at various times, whether I am active, sitting, sleeping and especially happens if I get upset. The pain is relieved with nitroglycerin tabs. I really need answers. Is it simply Angina?