Hi replacedflea. Please contact Jason Bergman. He is the Professor of Trumpet at BYU in Utah and a friend of mine. He recently assessed and helped one of his own students through a nearly identical issue. You could potentially have an in-person meeting as CSU is about an 8 hour drive (depending on Wyoming weather).
It seems you may be allergic to brass. Beyond that, I'm afraid I cannot help much. But yes, please contact Dr. Bergman.
https://music.byu.edu/team/jason-bergman/
https://music.byu.edu/students/trumpet-professor-helps-student-identify-metal-allergy/