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Concerned about heart failure

I'm a 48yr old male, 5'08" 155. Friday night I went to the ER with chest discomfort. My BP was about 166/100 and heart rate in high 90's. blood tests and toxicology were done. Troponin levels were fine, previous cholesterol was 118, but now showing 176. The doctor kept me overnight and wanted to do a nuclear stress test. My results are as follows for a regadenoson gated spect left ventricle myocardial perfusion study. Basically everything shows normal except the ejection fraction shows 43%. My heart rhythm is fine, and in the final report it says "depressed ejection fraction but no sign of CHF". My resting heart rate does however beat in the high 30's could this be the cause of my low ejection fraction? How accurate is the nuclear stress test? Will my EF progressively get worse? The doctor didn't elaborate, and just said I should follow up with my cardiologist. I don't get shortness of breath or anything like that, however I do occasionally get a little dizzy, mostly when I'm laying down, or standing up quickly and walking around, but am not sure if that has to do with chronic migraines and chronic pain from neck surgery, or meds. The nurse said I probably have heart damage, but the doctor didn't say that. Can I excercise? What type of diet should I be on until I find out more? Any help or advise is appreciated, I'm kinda worried. Thanks
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