This may not answer your question, but please make sure that your doctor explains any question or concern that you may have. He or she knows your health better than anyone else and would be the best person to explain what health risks you are currently exposed to.
I went to the doctor a few months ago because I had this uncomfortable pain on my chest that wouldn't go away. It felt like heartburn from hell, but without the burning sensation; so I thought, it had to be something else. Hm. Anyway, he didn't explain much, but said my blood pressure was really high and put me on Atenolol and some heartburn pills. At first, I was concerned, why would he put me on this medication if my blood pressure is high just this one visit? Apparently, it's been borderline high since I visited him in 2005, but I was never told about it. To this day, I'm still not completely sure about the problems that could arise when you have high or low blood pressure.
As to helping lower your blood pressure and cholesterol, working out is the best way to start. It's worked for me, although my chest hurts reaaaally bad when I work out vigorously and elevate my heart rate.