Mr J2 did, for years. Then he moved to France and after first GP's appointment he was referred to a surgeon and had a triple heart-bypass, since then he's been fine. From what I can gather, angina should be taken more seriously and causes investigated.
my friend has angina for about 11-15 years and it never progressed - she just takes medication for it - you'll be ok - try and not worry which is easier said than done because if you do start and worry it will bring on more attacks.