Heart bypass surgery symptoms and conditions

I have been taking Simvastatin 20 mg. for about two and 1/2 months now. It really lowered my Cholesterol but I have been extremely fatigued and now I am getting really dizzy when standing up and having some nausea.

I have read most of these complaints and I am wondering if Lisinopril is causing some problems I have been having. I am a 49 year-old female, and I suffered a heart attack in May of this year (2005.) I had heart bypass surgery(5 bypasses) and have also had to have a stint. I am diabetic and on insulin for blood sugar control. High blood pressure runs in the women in my family and I have had essential hypertension for years. I have been on Lisinopril since May. Lately, I have been suffering from frontal headaches, severe dizziness and nausea. I get so tired I have to lay down and my legs feel like lead weights. Last couple weeks I have had lower back pain. I feel terrible. I get nauseated, like motion sickness when I get on the computer and when I ride in a car. I've never had that in my life. I feel my symptoms are related to one of the meds I take. I feel sure it's not the ones I took before my heart attack since I had no problems with them ( plavix and aspirin.) I have also taken Lopressor years ago and didn't have these side effects from that. I am taking Lopressor and Lisinopril for blood pressure. I am going to call the doc in the morning because something is making me really sick and I can't even function. I've had to stop my cardiac rehab class, I'm lucky to even ride in a car lately.