My blood sodium is 134 range 136-145. i have never had my sodium low. what could cause this and is it dangerously low? also my total cholesterol is 298 and od is 204. im so scared i will have a heart attack and i know i need statins. please help?

Most common cause of low Na is medications. Look all you are on up at drugs.com. Na not dangerously low. Always repeat before getting excited about lab. Have no idea what "od" means. OverDose would be most common translation. Heart attack at your age VERY unlikely unless you have family history of early one less than 60 in women. Use some risk calculators on the web to estimate prob in 10 yr

Your slightly low sodium is likely pseudo-hyponatremia due to high lipids and is not a cause for concern. You should consult a cardiologist to manage your lipid issue.