Who wants to help solve a medical mystery?

Just to be clear, I have already seen my doctor about this and testing has begun to rule things out. So far, things have come back normal. In the meantime, I want to try and narrow down the issue before my wedding on Saturday.

In my first pregnancy I had fainting spells from the 2nd trimester and on. My doctor at that time never did testing or figured out the issue. My current doctor cares more. Good thing, because it seems to have started again in this pregnancy.

Here are the facts…
When it happens, I could be standing or sitting (but I’m usually standing). I am not going from a sitting to standing position when it starts and I’m not standing for a long time. I have recently eaten a meal. I’m not hungry or doing anything strenuous at the time. It starts out as a lightheaded, dizzy feeling. I become nauseous and my body feels tingly all over. Sitting down doesn’t seem to help it once it’s begun. I am not nervous or stressed at the times it happens. If I don’t lay down very promptly, things will start to fade and then goes black and I fall. When I come to, I’m shaky but feel okay for the most part.

Here is my medical run down:
-I’m 26
-I’m almost 17 weeks pregnant
-I weigh 130 lbs
-I take 500 mg Metformin a day for Poly Cystic Ovary Syndrome
-I take a prenatal vitamin
-My blood pressure is usually around 108/68
-I don’t suffer with fainting spells when I’m not pregnant

This used to happen so often in my first pregnancy I was constantly worried about when it might happen. I would be scared just to drive alone or go to a grocery store in fear it would happen while I drove or while in line at the checkout. Now it’s started again and I’m worried it will happen at our wedding ceremony. It’s embarrassing and worrisome and although the doctor is doing her best to slowly weed through tests, I would love some suggestions as to what might be causing the issue before this Saturday.