A blood test might be of benefit. Too much cholestoral? Try for a simple stress test on a cross trainer. You can achieve max easily on that, quickly, and see how long HR takes to reduce. 30 pointswithin a minute should be achievable with active cyclists/gym bunnies
I had a little too much cholesterol recently, (it was Mother's Day and I scoffed all the chocolates) and the result was surprising. I guessed all was not well.
Had a statin for a month and the result was vastly improved. Hope to be off the statin soon.