Near-fainting experience after exercising

[lol_nl]

Very often, I feel light-headed and dizzy after exercising. Usually this is not very severe and will pass over in a few minutes, but today I had another experience.

After running a few laps at rather high speed, I stopped running rather abruptly and continued walking. As usual, my heart started beating faster, and I began taking in more oxygen. I began too feel light-headed, and my vision blurred, as usual, but it didn't improve within a minute. Instead, I began to feel worse and worse, and at a certain point completely lost vision. I went cold and numb, and almost collapsed to the ground. Apart from that, I didn't feel much. My heart beat seemed very weak, though I hadn't really checked it. I didn't feel pain or anything.
Somehow soon after I started to see the vague lines of the trees and the road before me, and after a while, I recovered. The right part of my head ached for another 5 minutes or so, and then it was all over. For the rest of the day I didn't feel anything and didn't have any problems with vision, breathing, or pain.

Now some general information about me:
Age: 14
Height: 1.76 m or 5'8 feet
Weight: 55 kg or 121 pounds
Race: Asian/Chinese
Allergy/health issues:
-Several allergies, including hay fever
-Asthma when I was younger, but haven't had any problems with it the last few years.
-Nose-related problems (bleeding, constipation, difficulty breathing).
-Often blurred vision and light-headedness after exercising. I take longer time to recover from extensive exercising than my peers do.

Should I see a doctor? How to handle PE classes? Will this near-fainting experience have lasting damage on me? Any further advice?

[vienna13]

agree with often , I said something like that.....................................

[vienna13]

I wonder why my post was deleted. What did I say : THAT WAS FORBIDEN TO SAY?

[often]

of course, I am highly impressed at the level of literacy this 14 year old has....not a single "z" replacing "s".  Very good grammar and punctuation....color me surprised....and somewhat sceptical

[often]

underage posters should be directed to go to their parents with their concerns.  

[bbsstmez]

Wow, I did not realize that.  I know that they were studying the genetic predisposition factor in long qt (I releave that a Dr. Moss in Rochester NY waas leading the study), seeing your familial situation what do you know of this?

[maggiemag]

I am wondering if you are a bit underweight for your height?  Do  you eat a balanced diet and normal sized meals?  You don't have an eating disorder, do you?  You don't have to answer that, but it can cause electrolyte imbalances that can be severe.  Tell your parents about your symptoms, and get to your doctor for a checkup.  It might be nothing or it might not.  Good luck!

[vienna13]

above

[stevie_wonder]

Actually 14 years old for a girl is about the age the symptoms first manifest. In boys it is a bit younger. One of my boys was 9 when he was diagnosed, my daughter 17, and my other boy was 18. The ages vary but 14 for a girl is quite common. Both my sister and myself were between 12 and 14 when we first started fainting.

[CollegeGirl143]

you should definatly see a doctor to get some insight as to what may be going on.. It might be nothing, it might be something... Knowing is the important thing :) Go see your Primary care doc and he/she will likely give you a referral.

[bbsstmez]

Wouldn't long QT be hightly unusual in a 14 year old?  Is it not more common in a 20-35 year old age group?

[stevie_wonder]

Hi,
I would suggest that you go to a cardiologist for an ECG. There are many things that can cause dizziness after exercise but you should get your heart checked out.  Have him check your QT interval manually on the ECG. Sometimes Long QT Syndrome can cause fainting and near-fainting during and after exercise.