I have angina due to to having coronary artery spasms. How serious is this condition and can I have a heart attack through it.?

Heart attach. Yes it is so important for your doctors (pcp & cardio) to get to know you. Coronary heart disease not always has typical symptoms of angina radiating to neck/left arm, nausea or vomiting. It could be manifested as fatigue , indigestion leg swelling, or no symptom.
Variable course. If you have all the tests done and the cardiologist decided that you have variant/prinzmetal angina , you are prone to have a variable course. Generally you have good prognosis if they did not find any lesions on the cath.