Your cholesterol is high, but can be managed through your doctor with medications, proper diet, and
exercise. I recommend you start there and
stop a future problem since your testing shows you don't have any ischemia or infarction. Work on your cholesterol immediately, and hopefully you can prevent a problem down the road. If you have any symptoms (which you don't mention), then certainly don't ignore them and talk to a cardiologist as soon as possible.