Just had a heart attack
You're quite lucky that you could afford that hospital trip.  In the US, it would typically go like "My doctor made some tests and he said that it doesn't look like a heart attack but something is wrong with one of the lines on my ECG. He asked me if its ok to call the ambulance for doing more checks at the hospital. I said no, I can't afford that.  So I died four weeks later."This isn't an exaggeration.  Many people live paycheck to paycheck and can't afford the thousands of dollars a hospital trip would entail.