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This is Dr. David
it doesn't sound like your C5-6 neck fusion surgery was a success if you are still having upper chest and shoulder burning pain and muscle spasms.
you might benefit from nerve pain medications like neurontin or lyrica to help decrease nerve pain.
your shoulder inflammation could be compensation for your back and chest muscle spasms.
you most likely are still having impingement of nerves coming out of your lower neck and upper spine area
you might need to try a TENs stimulation unit to distract nerves or an implanted spinal stimulator to see if that helps decrease pain.
you said that the epidural did help take away pain.
so the pain is coming from pinched nerves close to the spine