Experience of fainting and visiting the emergency room at Uijeongbu St. Mary's Hospital

Fainted while playing at the campsite and fell on the gravel area.
Emergency room visit in the early morning due to tearing between the eyebrows
This is my experience of fainting and receiving emergency treatment during a visit.

Last winter, I went to Pocheon Auto Camping Site with my friends, but since it was winter,
While sleeping inside the tent with a PASECO heater on, the ventilation was poor, and my head felt very...
I went outside to walk because I was feeling sick, but I have no memory of whether I fainted suddenly.
Seeing me lying on the ground, the campground owner came over to our tent.
I contacted him, and my husband carried me inside, and at that moment, I felt nothing.
I don't remember. They say it's been about 30 minutes. What about the place where I fell?
It was a spot made of crushed gravel, but did that stone hit between the left forehead and eye?
It was torn and bleeding heavily, but I didn't feel any pain at all.
Hurrying, I went with my husband to the emergency room at Seongbo Hospital in Uijeongbu to get it cleaned, even during the cleaning process.
They sit in a chair, wear a plastic gown on their neck, and spray disinfectant on their face.
At that time, I experienced intense pain. I immediately contacted the plastic surgeon for emergency treatment.
When I looked in the mirror, my face was really a mess. Overall, it was swollen and my eyes were puffy and swollen.
I came back to the campsite, packed my belongings, and headed home, but I had a very dizzying experience.
Even after coming home, I go to Beomgye Lee Won Plastic Surgery near my house for about ten days to change the dressing because of the wound.
The bruise is still faintly visible now. At the moment I fainted, I really felt nothing, no sensation or pain.
The feeling I remember before fainting is a queasy and nauseous sensation, with a slight cold sweat.
The feeling I had was just like this. I was truly in a state of complete unconsciousness.
I never want to experience something like fainting again. Just in case I end up using a heater.

If it exists, ventilation is really important.