Haley,
I was diagnosed with a reading seizure disorder (basically Primary reading epilepsy) over 20 years ago. At that time I was the 9th case reported there was no real information on this form of disorder. Your signs are exactly what happens to me. I know how scary it can be and yes public speaking can be awful. Have you seen a nuerologist and received any meds? Mine can be control with medication but most often I know the warning signs (jaw jerking) and tend to refocuse myself when these occurs.
Hang in there I made it through high school and college with the same problem. I will try to answer any questions you may have, I know how tough it can be.

Todd