Frequent Fainting

[chachi_nichole]

Ok so my sister is a few months from 16, 5'3 (about) and roughly 130lbs.  She is very active 5th-8th grade she did volleyball, basketball, softball, dance, and tack, in high school she does volleyball and she attempted basketball but she has a breathing issuse so she supported her team from the bench mostly.  She has had very severe migranes for as long as I can remember.  In 7th grade (3 years ago) she played basketball and if there werent relax/ not constant running she wouldn't be able to breath in just out.  Doctors said it was asthma but none of the asthma treatment worked.  Recently (Febuary) we went with VCD (vocal chord dysfunction).  We had her hypnotized and it worked for a game and a half then she couldn't breath again.  
So basket ball was over, but she had gym class, but everything was fine in that.  Until May 10th, 2010. she was riding a bike in gym fell over and fainted and she was feet away from getting run over luckily a semi stopped to block the traffic for her.  It happened once more that same week and then once a week until mid June.  they said she has low blood pressure, and it is very low like 70/45 is an average.  She has had a heart monitor, EKG, told to eat more salt, brain scans, every possible test at least 2 times and nothing has changed.  We have seen cardiologists, our family doctor, pediatrians, neurologist, and a electrophysisist.  She was put on beta blockers but we were told they wouldn't stop the fainting but make them fewer and  it did.  
My parents are afraid of her injuring herself when she faints and would like to figure this out.  She never faints around my parents or myself, even if she is doing something in the same conditions as when she fainted bfore she won't faint around us, only at school when I am not around and she is with her friends.  Doctors have said it could be something with her adremal glands, but they haven't done anything about it.  Personally as her sister i think it has something to do with her parasympathetic nervous systems, which when overactive causes ones broncial tubes to constrict (asthma like) and blood vessels to dialate (low blood pressure) and plays a role in fight or flight.  However since I am a teenager no doctor will listen to me even though my cousin ( who is a doctor) says my idea is a very likely one.  I have also thought of a small tumor on her spinal cord, she doesn't have a brain tumor and doctors have ruled out a cerebelum issue.  
If anyone has any advice or similar experiences i would appreciate feedback, answers, or if you need some help because this is happening to your sister or daughter, etc. feel free.
Oh and one more thing my parents are running out of money to keep doing tests so if anyone has a treatment or helpful ideas that don't involve 20 more test to be done, that would be amazing.
THANK YOU!

[sweetpea03]

Your idea sounds pretty good, and I'd take it up with your parents for them to bring up the idea when at the doctors office. It can be frustrating going from doctor to doctor, but eventually you'll find one who will help. With sports make sure she is very well hydrated, as that can cause fainting. Since you say she only faints at school and with her friends, I wonder if she is up to something else that none of you know about. Has she ever tried/is doing drugs?It's a little odd that it doesn't happen everywhere.

[Libby2999]

I really wish I could help, although I cant do much than support. I'm sure your scard all the time about her. In thinking if it is her nerve system a factor could be being away from the family. You know, not being as safe and needing to feel a little more alert. That could be a part of it. That is really weird. Most people would say to just stop all sports but by the way you make it sound like she loves sports.

I'd say encourage her in sports, although I'm now thinking that if you encourage her to give it all she might faint again. I have somewhat a lower blood pressure, not beyond low to call it low but lower. Eating carbs help me so I don't become fatigued as quickly, and also not eating right before I swim helps a ton. To digest food takes up energy so if her bodys working to process the food it can't always put energy were it needs it to preform in the sport. Just don't give up, she won't have to ever give up sports. I hope you can find a med that works, all my luck.

~libby