Exercise Induced Seizure-Like Episodes

[Swimpossible]

Beginning in July of 2005, I was hiking and suddenly began feeling strange, like I was going to black out. My eyes stopped focusing on objects, the muscles in my face and hands felt paralyzed, tremors in my whole body, my skin felt cold (I was told by the paramedics), and my eyes would'nt dialate. The hospital wrote it off as a mixture of low blood sugar (my blood was never taken) and altitude sickness.
Then, in December I began a new circuit training class and the same episodes continued to happen and worsened each time. I had another one last night, at the exercise class, and it was the worst so far! In addition to the symptoms listed above, the tremors, and paralyzation are much more severe and (during the last two episodes) my speech is slurred. The paramedics tested my blood and my blood sugar was normal.
I have been to see a neurologist (who ran blood tests on my thyroid and a lot of other things. But, the blood was not taken during or after an episode so they came back normal).
So, now anytime I do this particular exercise class it sets the episodes off.  Which is really frustrating because I enjoy exercise a lot; I have been a swim instructor for 10 years and I have never had this happen in the water. I also went to military school where we exercised 24/7 and never had anything like this. I would really appreciate your opinion on this matter:)

[caregiver222]

Let's look at this logically. When you exercise you increase the amount of oxygen required. You are use up glucose. This leaves us with two areas of investigation. Lets explore both of them. You need firstly (a) a glucose fasting test or  (either one) (b) an insulin clamp protocol to determine the rate of glucose utilization and secondly (a) a cardiac stress test, which also measures P02.  You need to investigate the possibility of ischemia (lack of oxygen) secondary to cardiac insufficiency or vascular impediment. The vascular impediment is intermittant so it could involve a spasming of the muscles surrounding a blood vessel. Taking a single blood sugar test at a single point in time is completely meaningless.

[Robinsonova]

My daughter has had similar symptoms recently.  We've taken her to her doctor, neurologist, cardiologist, etc.  
Extensive blood work has been done but no one seems to know the problem.  She also is suffering from fatigue.  Is this one of your symptoms as well?

[hyepod]

Neurologic signs and symptoms sometimes can be brought about by cardiac disorders.  For instance, an "irregular beat" can cause a host of problems.  Consider making a cardiologist your next stop.

[fcar]

If you havent already taken an MRI please do so.  It might help. also how is your blood pressure.  High pressure can do a lot to someones physical body.

Wishing you well.

[myproblem]

Do you sweat at all?

[nicobella]

DO you actually pass out or have a seizure or are you just saying that you come close to that.
have you been under a lot of stress lately?? maybe anxiety??
definitely get a neuro work up. maybe cardio as well just to be sure.