I'm not a doctor but I would not do anything invasive, not yet anyway. I'm in a similar position to you. You need to visit a good cardiologist, start taking statins to lower your LDL whatever it is. I now use Praluent which is an injectable twice a month and it lowered my LDL tremendously to the point where I almost do not need statins. Now I take a minimum does of 10 mg. You should also get a nuclear stress test and sonogram to determine if you have good blood flow. If you do and you get that LDL down, you have minimal worries, no more so than anyone else. Of course, you should cut down on red meat, lose weight and exercise but it sounds like you know that. good luck. please do not jump to invasive procedures before trying these measures. best of luck.