I've never had any cardiac tests or follow-ups. There wasn't any pain or numbness in my left arm. It was just an area of skin near my left shoulder blade on my upper back. It felt like shingles pain. I had shingles on my torso over the summer. It was that same itching, burning, prickly pain.
you might contact the MRI facility, sometimes they can lower the cost if you have no insurance or work out a payment plan.
back/shoulder pain on LEFT side can often be attributed to cardiac problems. Are you up to date in that area?