Why does my stomach make so much noise?..Even when i'm not hungry?

It's getting really embarrassing now. And sometimes it's not even like growling noises, but other noises ...I don't really know what to call them. Sometimes it happens after I eat, like I just had a patty right now and it's making funny noises. Yesterday I ate before class and drank lots of water and about an hour and a half into the class, just before the class ended it made this funny noise that sounded like a long, meowing fart. And we've to sit close to people in that class and the two guys beside me heard. They didn't look at me, but they shifted and I saw side glances. It has happened in other classes as well and the noises are really loud that no matter what, people'll hear. Even yesterday in another class, it was just making noises left and right, but that goodness it wasn't so loud, but it did make one loud one at one point and the girl next to me heard, of course. I usually drink lots of water and take a water bottle to lass with me so I can sip it from time to time and this seems to help stop the noises from coming or make them not as loud, but there's usually a few loud ones that'll come regardless, and in this class yesterday, I had bought a muffin to that class because of this reason, thinking eating something would stop, but the noises still came. And i wasn't hungry, btw, I'm afraid of going to class now. I thought this happens when you don't eat enough and now that i'm eating better, they're not getting better, Could it have anything to do with the way I sit? Usually the way i sit at home because of the temporary desk i use right now, i'm hunching my back most of the time and contracting my stomach. I don't know if that has anything to do with it. The other day I had a really bad case of diarrhea, which i think was brought on by stress, but i'm not sure. I went about 7 times. I take msm and another multiviamin, could this have anything to do with it. I don;t drink a lot of milk, I do eat eggs and have no limitation with food or allergies, but i don't a lot of things like mayo, butter, chocolate, peanuts because they give me breakouts and i've been battling acne for a while now. I read from another site from someone saying they knew someone with stomach noises and they took a spoon of olive oil in the morning with food or before eating...something about the fatty acids breaking down bacteria?...and the problem went away or at least greatly reduced. I'm going to try that tomorrow morning and see how it goes. I'm just trying to see if anyone else has had this problem and what worked. Maybe there's something i'm eating and shouldn't be, or my body;s not as healthy as i think it is. I'm afraid of going to classes or anywhere else, especially when there's silence.