@jmb73 You might want to see a physical therapist for an evaluation. I've had similar symptoms and I have thoracic outlet syndrome which is enough to cause muscle spasms in my neck and chest, twisted ribs, and headaches that are muscular in mature. Finding a doctor who understands TOS is difficult as it is not covered well in medical schools. My physical therapist does myofascial release which helps a lot by releasing tight fascia that is restricting movement and normal function. You can do MFR work without having a diagnosis of TOS, but if you have TOS, you may be able to have physical therapy long term. TOS does cause breathing problems for me and Mayo is a good place to go for an evaluation of this. You can also try teaching medical centers that treat TOS to look for a specialist.

Here are some links with information and the link to our Connect discussion on MFR that has a lot of information.
https://www.mayoclinic.org/diseases-conditions/thoracic-outlet-syndrome/symptoms-causes/syc-20353988
https://www.painscience.com/articles/respiration-connection.php
https://trainingandrehabilitation.com/how-truly-treat-thoracic-outlet-syndrome/
https://connect.mayoclinic.org/discussion/myofascial-release-therapy-mfr-for-treating-compression-and-pain/