Let me tell you this. I have same thing. I feel Im making constriction ( neck ) even when talking, and Im feeling very strained and tensed in the area of vocal folds ,neck, shoulders . Other people cant hear me , so I have to force a little. Its all about habits. I played 15 years on my instrument the wrong way, thats why I do with the voice also. We need to relax ,and watch Greg videos from begining.
<<Could some of my trumpet issues be caused by a larynx problem? If I cannot speak efficiently, it follows that playing a wind instrument would be a challenge.>>
– You answered your own question.
Liz Bills has videos on how she healed.