It is hard. I have a lot of friends also who have good marriages. But I just have to keep reminding myself that I am better off without him. Just because your married, doesn't mean your happy. And being divorced is not the end of the world. But the longing for what could have, should have been, is what gets to me at times.
On the other hand, a friend came up to me the other day, and told me that she just found out that T and I were not together anymore, and that I looked happier. She looked me right in the eye,and told me that she was sorry that we had to come to that point,though.
Please take care of you. Look into the being dehydrated theory, drink your water, take your vitamins, like B12, for stress, and if you still keep fainting, keep pursuing it with the doctor. Don't let them blow you off. It could be stress, but then again, it could be something else. The Lord's Blessings on you ,H