passed out at 29 weeks

About 7:30 last night I began feeling really dizzy and lightheaded. I didn't feel like I could make it to the couch so I sat at the kitchen table. My boyfriend was about to go outside and I wanted to tell him to stay because I felt like I was going to pass out, but didn't say anything.  Next thing I know he's asking me repeatedly if I'm ok. I had no idea what was going on. Then I realized my neighbor is next to me on the phone with 911 talking about me. I passed out face first onto the kitchen floor. My bf said I hit my stomach but it seems like my face mainly took the impact. I have a large knot on my forhead. My tooth went thru my bottom lip and my whole mouth area hurts. After 3 hours on the fetal monitor baby has a clean bill of health. Thank god! They couldn't find a cause of the episode. All labs were normal and said it was most likely due to dehydration or stress. I have been probably more stressed out the past year than any other time of my life. I think it's time to make a few changes and get myself to destress a bit. So thankful my little man is ok :)