Stomach rumbling during quiet classes aaaaaaaaa

I have a curse I’m 99% sure
Whenever in a silent class doing a practice paper by stomach decides to go NUTS.
One time it was really loud because I was sick and therefore wasn’t eating much, and the entire class was laughing but thankfully couldn’t pin point it to me and blamed the girl next to me. It’s really embarrassing and I’ve started to skip assembly out of fear it’ll happen then. It’s causing me a lot more stress then it really should and I panic constantly during lessons in case we have to work in silence and my stomach rumbles. Does anybody know how to make it stop? I’ve started to eat a breakfast bar before my morning classes in hopes it’ll help and it seems to be somewhat okay so far, but I’m still paranoid