Hello dear user!
Thank you for asking us on HCM!
I really understand your concerns.
Pain in arm and neck associated or not with
numbness is generally caused by issues related to the neck
spinal cord or as we call it "cervical spondyloarthrosis".
This is a conditions where
nerve roots which come out from cervical spinal cord are pressed by the vertebra. Neck, and arms nerves come out from this part of spinal cord.
If you have done the heart check up and examinations and everything has resulted ok, I would recommend your a spinal cord x-ray or a
MRI which is the best option.
The treatment of this medical issue varies from the grade of damage. It may be conservatory with pills, with exercises in low grades and surgically in high and severe grades.
Take care and i hope you will be better soon.
I wish you a good health!
DR ERIOL.