Yeast, msg

Hello, I once ate a piece of freshly baked bread and got really sick from it so I stopped eating all bread, then I just read that usually migraines are only caused by fresh yeast in bread so the bread you buy in bags is ok. But I am also very sensative to msg and I read yeast contains msg so dose that mean I can’t even have the bread in bags. I was also wondering if anyone has ever had success from a medication that helped theirMAV to the point where they could eat their trigger foods again. Thank you for your help.