@Paralee, I think it's worth asking and I only mentioned diabetes b/c this is the first thing most doctors think of the with GAD65 autoantibody. My Endo has ran every diabetes test possible on me and I am negative on them all so we know I have the GAD65 Auto-Ab for another reason (at least so far).
Do you have an extremely exaggerated startle reflex? Mine reached the level that just our doorbell or an every day sound could startle me for hours. Our fire alarm went off and we think it triggered a "startle seizure" (but no definitive proof of this). Since high dose IVIG, the startle reflex disappeared. I was at a restaurant w/family back in Nov and someone dropped a tray which shattered on the ground and it didn't even phase me. My family was in awe b/c prior to IVIG, that would have triggered a reaction with tachycardia, full body shaking, teeth chattering, confusion, difficulty speaking, muscle cramping/shaking, etc. And now, nothing. So I know the IVIG is lowing this antibody. There is no other explanation.