How to avoid passing out in yoga class?!

How to avoid passing out in yoga class?

How to avoid passing out in yoga class?
I've almost passed out in the past 3 yoga classes I've gone too- my vision gets really dark, and my hearing starts to fade- like a really bad head rush! It's embarrassing to revert to the child's pose when everyone else is doing what they're supposed to. How can I avoid this? My instructor said that it may have to do with low blood pressure-- how could I change that? I am breathing normally too- so I don't think that's it.

I used to have a similiar problem where I passed out often. The doctor said it was my bodys reaction to certain stressors. Keep in mind stress isn't just feeling upset and angry it's literally the pressure your actions can put on your body. So, if you look at it that way, perhaps the Yoga is stressing you in a way you can't understand. I'd skip yoga until you've had a dotor analize your BP and perhaps run some heart tests to see how your hearts pumping...good luck!