Basically repeating what other have said but... get your comfort level up at home to retain the rested buff the whole time you are adventuring. Don't go out at night or otherwise get frost resistance to avoid the cold debuff. Keep fed for a large stamina bar - even high HP food can give a big boost to stamina, but there are several foods that can give a big boost to stamina specifically. Carrot soup is easy to farm up and gives a large stamina boost. Finally, avoid getting wet - this is the only painful one since you can't avoid this in the swamp so if you're in the swamp sorry it's just awful and keep chugging until you get past it - it gets better after you've finished it.