Yeah, those are on another level. The first time I played, when I still used only one saveslot, I didn't learn antitoxin, bad things happeded and there was a frase like "is not like you could reverse time and make other choices" so I go to load, but my last saving is way to early in the game and I'm forced to continue, I was so sad and from that time on I started to save every time I can XD