Can't stand listening to people eat!

I can't listen to people eat. I can't be in the room when some one picks up a bag of chips. If I'm in class, and some one begins to chew on an apple or a sandwich or a candy bar, I can't focus. It elevates me to such a level of stress that all the muscles in my shoulders and back tense up. I get irate and generally angry with the people eating, especially if I know them personally. I can't watch people eat or drink. I'm alright in a cafeteria or somewhere else where there's a lot of intense noise, otherwise, I need to have head phones on. Other noises bother me, and when people twitch. A boy next to me in one of my classes jiggles his leg a lot, and it makes me crazy, enough so that I tune out of what the teacher's saying and not matter what I try to do, all I can think of is the jiggling of his leg. If I'm driving with some one (a lot of people in my family are restless) and they start twitching, tapping, messing with a zipper, moving their legs, fingers or arms restlessly, I can't focus. I just zero in on that little thing and obsess over it. It makes me hostile and edgy. Certain movements become invasive to me, like when some one rattles a can of Altoids to the beat of a song. It just sticks out to me like a pin in my side. There is almost no one I've met thus-far that I can eat with comfortably. My own boyfriend makes me want to climb walls. My family now excuses me from the table to eat my diner. If I'm in a room and some one comes in with food, no matter what I'm doing, I get up and leave, right there. The sound of a spoon scrapping or hitting a bowl repeatedly gets me upset. My grandmother has suggested I might have a sensory issue. I'm beginning to think it might not just be that I'm a jerk. Can any one give me some information or suggest who to talk to?