Chest flutters/spasms in left breastbone, (pectus carinatum) extreme pain and have been diagnosed with SVT & possible nerve/muscle damage va can't fix?

Can't fix? Nerve damage, in particular, is often not correctable but svt virtually always is. You have separate problems. There may not be much to do for the nerve damage other than medications that modify the pain but see a cardiologist for the svt. That can be helped!