Are you me? I have the exact same symptoms, especially the left arm pain and panic attacks. Full heart checkup and nothing was found to be wrong but I always suspected it had to do with my nervous system.
Yup, that sounds like a badly wired myocardial pain circuit.
There are well known instances, like the Markus-Gunn syndrome where the mastication commands projects onto eyelid muscles. Similar bugs may occur in other circuits.
You should read about TMS by John Sarno (see divided mind). Maybe it can help you too like it helped me. Your symptoms sound a lot like it but ofcourse you need to read it and decide.
Not the original grandfather, but I'm a fellow migraineur. I read Sarno's book, and found it to be unhelpful. From what I remember, the gist of it is that "unresolved emotions" cause a great deal of physical problems in some patients. That's not a theory I'm willing to trust.
There are well known instances, like the Markus-Gunn syndrome where the mastication commands projects onto eyelid muscles. Similar bugs may occur in other circuits.
https://youtu.be/g7e2rFua0Sw?t=7s