Haha that's a bunch of questions. But I'll try to answer to the best of my ability!
Well what I felt wasn't all that bad - I dissolved 20mg SN in a glass of water and it's probably the most salty thing I've ever tasted. Horrible. Over the next 30 minutes I got progressively more nauseous, although I didn't have a feeling that I was going to vomit. I wouldn't call it too uncomfortable. No pain, no throwing up.
The only reason I failed was because I was found. It was a matter of minutes between me taking the first sips, and my lips and fingers turning blue. Way faster than I expected, and someone saw me by accident. The ambulance was called, and I remember losing consiousness about 30 minutes after drinking it as the ambulance arrived. I was treated by what felt like half the hospital staff and the next day the doctors did say that the dosage would've been lethal. I hate the idea that I was saved, but it's the reality that I've got to live with.