What nonsense. I'm Canadian, I had symptoms of an arrythmia, went to a GP to describe what was happening, and I had an ECG done and bloodwork drawn at a nearby lab less than an hour later. This was all while I was not exhibiting symptoms.
Like msbarnett says, you can't just roll into a clinic and say "I don't feel well and I'm scared and my cousin who's totally a doctor thinks this is what I should do! Also an MRI please!" Go see a doctor, and let them decide what diagnostic tests are appropriate, and you'll get them done.