Sometimes increased cholesterol can also be a symptom from an underlying issue. Cholesterol increases from stress. You did not mention your height or weight. Over weigh can tribute to increased cholesterol.
To lower your cholesterol through diet is to eat low fat meats (chicken, fish, loin of pork) or non meat sources (soy products), low fat vegetarian combinations (rice & beans, pasta & beans, low fat cheese & pasta), fat free or low fat dairy products (skim milk, 1% milk, low fat cheese, low fat yogurts, low fat soy milk/yogurt), and eat a lot of fruits and vegetables. Eating daily high fiber breads and cereals (oatmeal) and ¼ cup or less of nuts (walnuts, peanuts, cashew) will help in lowering cholesterol too.
Try to eat your meals in a calm and relaxed manner, and not while you are working or doing other tasks. This will prevent over eating. If you change your eating habits to the above and the cholesterol levels do not decrease after 3-6 months, then see your MD about lowering cholesterol-lowering medication.
Best of luck and thank you for your question.