Please discuss all this with your gynaecologist. It may or may not be related. If pregnancy is expected or suspected then ...the black out episode may be due to that ....if not then you have to see a physician and later an eye specialist too. You may be required to check your BP. Blood investigations And your doctor will tell you if you might require a brain scan as well. So please go to the doctor ...don't neglect.....even if this episode might have been due to simple stress....please rule out.