I thought I'd better post here, as I very recently failed to ctb via GBL, which uses the same mechanism as 1-4b. My failure was due to vomiting.
My dosage was 70ml, with around 250ml of Jack Daniel's, the Jack was administered over about an hour, mixed with cocacola, and the GBL was taken in one go, mixed in cocacola. First thoughts is it tasted foul, it was awful. Then after 2mins or I started to get tingly and feel really good. Based on the last part of the playlist I remember, I passed out maybe 7mins after taking it. Now at some point I vomited pretty much every thing out and feel off the bed. As I was laying on my back, I suspect I fell out trying to turn to avoid checking. Falling out removed my headphones, which pauses music, but the playlist already finished, so the vomiting occured after 40mins. When I fell out I landed face first and it appears I broke my nose. However I did not notice this fact until bumping it about 2 hours after waking whilst in the shower. I woke up about 8hours after taking it. I felt absolutely exhausted physically and mentally, so much so that I could bearly move. I also had a lack of touch, even after being able get up, I did not notice I was standing and lying in sick. Over the past 4 hours I have stayed in bed, my touch has returned, I feel less tired. I have not got any sleep. I'm not sure if this is due to the bleeding nose or the drug, perhaps both, but I have a blocked nose that is producing copious quantities of phlegm, such that I have to swallow a big ball every few minutes. I also have a mild fever and a headache, as well as a sore throat due to the vomiting. While this isn't the most pleasant, for a suicide failure it's not to bad. With antiemetics and Bezos on the way, I think I have a much better chance.