I'm 21 and recently went to see a doctor because I wanted to know why my heart sounded arrhythmic in my head – I first noticed it when I was 14, but my doctor said it was nothing to worry about. This time I was sent to see a cardiologist. They did a Holter test (sinusrhythm tends to be tachycardic, no pauses. Rare supraventricular and ventricular extrasystoles) and then a cardiac stress test (resting ECG: tachycardic, functional capacity: 8.7MET, HR response to exercise: hyperkinetic, BP response to exercise: normal, no chest pain, no arrhythmias, no ST changes) , ten minutes later I was diagnosed with "Cardiomyopathy in infectious and parasitic diseases classified elsewhere (I43.0)" accompanied by "other specified heart irregularity" and "supraventricular and ventricular extrasystoles" and "fits of tachycardia" (I49.8) although I wasn’t ill as a child. The doctor told me I might have had a hidden tonsillitis and prescribed me Metoprolol. I was told not to gain weight, to be careful with exercise and do a stress test once a year; then I was sent back to my family doctor who decided to check my blood for anemia - I'm currently waiting for the results.
I don’t have many symptoms, but I have trouble falling asleep because my heartbeat doesn’t slow down enough and I’ve never been able to run without becoming lightheaded, but I’ve never been very athletic either. I do enjoy walking and a 30 mile hiking trip isn’t a problem.
What I really don't understand is where I43.0 falls on the list of cardiomyopathy types. Is it dilated or something else? Is I43.0 a completely different type? Is my heart muscle damaged and will I be on medication for the rest of my life?
Should I go to another cardiologist to get a second opinion and ask for some more tests?
*I'm 11lbs overweight and my family has a high risk of hypertension (usually becomes a problem after we gain weight, which is another thing we are prone to). My glucose, cholesterol and magnesium levels are normal.