I've been having these episodes for about a year and a half now that last for about 10-30 seconds. They begin with a loud whistling sound that sounds like my ear is right next to a boiling tea pot, and then I can feel a great tingling sensation inside my head and lots of pressure and my vision becomes dark and grey, yet still clear. This lasts about 2-5 seconds and then I feel the tingling travel down into my right side and into my arm and at this point my arm becomes numb and trembles. At which point I have no control over my arm. There have been times since this has started that the trembling has traveled down to my leg but this has happend only when the episode started when I was in a standing position. During the episode, I am completely aware of my surroundings and can still speak but it is slurred.
I've researched symptoms on numerous medical sites and have found nothing. I have described this to a doctor but he thought it might be caused from low blood sugar, but I was tested for diabetes and all my tests came out negative. So...it's now been a year later and I'm still having the episodes about 4-5 times a month.
Any idea of what is going on inside my head?