Thank you for the information,
I will put my opinion regarding the issue.
The pain and burning sensation in the left upper back, shoulder blade and back of arm, triceps area can be due to nerve irritation or entrapment of nerve in the spine.
disease, neuropathy can have a burning sensation.
When your pain is coming from behind intermittently, it may not from heart disease.
But still heart disease is of serious concern it should have an EKG to exclude any heart factor.
As it is going on for a long time, you should consult doctor for examination and investigations to find out the cause and start of treatment if it is necessary.
I hope this information helps.
Happy to assist, if you need any clarification.
Please feel free for any follow up query.