Just out of curiosity, and sorry if it's been asked already... is it because of the reaction in the gut that SN can cause vomiting, or from the anxiety that results from taking it, maybe a combination? I think my wife would notice if I started a 48hour regime unless she was already on vacation, so was considering trying without meto—it's been years since I vomited, I usually have no trouble with nausea at all.
Considering the exit bag as well. SN just seems easier, and costs less (my wife has earned all our money so either way I feel like she'd be paying for my supplies and I don't want to spend as much if I can), and I could just take it and lie down, not have to coordinate a gas system.