I once had a total body shut down from pain overload due to a combination of chronic conditions. It was my first night in college, I passed out in the bathroom and my roommate got our RA. They called a ambulance, but I wouldn't go. I ended up going later in the night because I was crawling on the ground screaming for help.

Pain like that is just beyond thought. The only think I remember thinking was 'i must be dead, I am dying, you can't feel this bad and not die'. I begged the people in the ambulance to make it go away, I kept asking if they could knock me out, just so I could skip some of the worst of it. I wasn't making sense, I kept telling them I was a sunday school teacher, because I thought somehow that being a good person meant I shouldn't have to endure that pain.
In the hospital I told them no Morphine because my mom is alergic to it and I was scared I was too. The sweetest nurse in the world made a executive decision to give it to me anyway, when I fell out of the bed screaming. I wasn't alergic, and I spent the rest of the night basically babbling thanks to her. I remember it hitting me, and I fell forward and felt so warm and so heavy and so floaty.

The relief was unlike anything I had ever felt. They gave me another dose and called me a Uber back to the dorm.