The condition can be variant angina or ideapathic coronary spasm. The underlying cause could be an electrolyte, chemical imbalance causing a rhythm problem. More likely it is ideopathic (cause unknown). The spasm constricted the artery and the lack of blood/oxygen effected the heart cells and induced angina (chest pain).
The probability is very high in your favor that heart cells remain viable and function sufficiently normal with restoration of a blood/oxygen supply to lower portion of the heart.
You probably had a complete blood test that showed markers for a heart attack, EKG and did you have an echocardiogram? A stress test with an injection of a dye substance for perfusion through the lower portion of the heart can help determine degree of damage if any and some heart muscle viability and not necrosis.
Several years ago I had a silent heart attack and was in ER for 3-4 days with consgested heart failure. The RCA was stented providing more blood to the deficit area and wall motion returned to normal with medication as well as a reduction of heart size and normal contractions.