Sam, I understand almost exactly what you are going through. I'm 18 years old and just over 3 years ago I started experiencing these weird, I guess you would say episodes. Sometimes I would have several a day and it happened a lot when I was in class. I was diagnosed with panic disorder and they told me there was nothing they could do. I felt exactly how you described....Dejavu feeling, you can hear what people are saying but you just sit there and stare. I would stop breathing and it would be like a dream in the middle of the day not lasting more then a minute. I would always see this singing toaster. Odd I know. Anyways, this went on for over 6 months until the day before I turned 16. I woke up with a massive migrane going from my nose to the base of my neck. I took some asprine and went to school. I ended up coming home early, slept, woke up and went to go to the bathroom. Thats when my mom found me having a grandmal seizure. I went on tegretol, but it made me really wired then I switched to carbamazapine. Much better for me. I spent the next two days sleeping and visiting the doctors. They could find nothing wrong with my eeg or my mri. We don't know why I had it, but it turns out those previous little episodes were petite mal seizures, little versions. I've been off my meds now for 6 months and havent had a seizure since that first grand mal. I don't know what to tell you other then what you are experiencing are petite mal seizures like I had, but there are others like tingling of extremities, my thumb used to go kinda tingly/numb for a few seconds. Anyways, I hope this helps.
jessica