I have a friend who used to drink too much water. This eventually lead to him having dangerously low sodium levels but he didn’t know that. One day, he knew something was wrong and was yelling to his landlady next door to get help. He passed out outside of his apartment. Then he was in a coma for 4 days.
I asked him what the coma was like. He said he remembered having a vague sense of panic like he was still trying to get his landlady. He doesn’t remember, but when he first woke up, he was screaming her name and fighting the nurses.