Reasons for high pulse rate can be stress or anxiety.
Do your EKG at the time of raised heart rate
, if it is normal than you have to consult psychiatrist
for better treatment. If you heart rate is more the 140/min than it can be PSVT or AF, you must seen your cardiologist for that.
To decrease you cholesterol
level you must control your diet, avoid all fatty, spicy, oily and junk food, do regular exercise for at-least one hour (brisk walking is enough), reduce your weight if you are overweight
Hope this will help you.