POTS and Pregnancy

I am 22 weeks pregnant with my son and I have been diagnosed with POTS/Hypotension for almost 4 years now.  I have been researching POTS and Pregnancy because I want to be prepared for the worst.  Originally my greatest worry was passing out during labor (possibly not waking up), now I realize there are many more complications to pay attention to.  I would greatly appreciate any comments, articles, and experiences with your pregnancy/labor&delivery with the combination of POTS.

1. What happens if you pass out during labor or even before the epidural?
2. Which do you find is safer for the mother and baby: vaginal birth vs. caesarian birth?
3. What is your biggest worry with POTS and Pregnancy and why?
4. Do you have any other information that could be helpful in my pregnancy?