I was always remonded by my instructors to open my throat more. I quess it was poor technique. I used to have migraines. I noticed that by opening my throat and practiced breathing methods reduced my headaches. I agree that horns are all different. The Schilke X3 plays much more freely than My Yamaha 6335, or Bach Strad ML. However, now I play a medium bore Callet SIMA and have no problem at all. So I agree, it is more the player and technique that is critical, and try various horns before I settled on a major investment. I pray that you have no further problems with your brain and live many years. Thanks for sharing. It is encouraging to witness your courage in playing. God Bless.