CAC scores never decrease.
You don't mention your lipid numbers - without these any discussion is difficult and somewhat uninformed. We can assume they are not good as your doc is concerned enough to recommend CAC scoring.
You don't mention your weight and sugars - glucose and A1C - ie, whether you are pre-diabetic or diabetic - also essential to understanding your circumstances.
At a minimum CAC testing, and stress test with echo. These first steps (in addition to treating lipid issues) - and, for goodness sakes, unless you are having some bad side effects, take your statin - if you have high calcium it could save your life. If you are having side effects, get on an injectable statin.
The internet can be your friend by providing access to extraordinary information you can discuss with your doc to get you on the right track - or, the internet can provide nonsensical unscientific, conspiracy junk.
Post your numbers and you'll get more useful feedback.
@mayoconnectuser1 - my LDL is 226, my HDL is 67 my total is 321 which is way over the 200 limit so I suppose its not great. Yes Im currently taking 20 mg of lipitor daily and have cut out egg yolks, cheese, and watching my intake daily. I weigh 115 lbs and am 5 ft so not overweight. My glucose is normal, not pre diabetic or diabetic although my mother and son both have diabetes. Ive had stress tests done. Both types including the one with ECHO which showed my heart to be fine and beating without any arrythmias or anything. I am not unhealthy I dont believe. I dont smoke, dont drink alcohol hardly ever except maybe wine on special occasions. I try to get 8,000 -10,000 steps or more in daily. I didnt realize how much feedback i would get on this post. Im almost 55 and no prior history of heart disease. My heart dr is concerned about my high cholesterol so that is why he recommended this test. Hope this helps.