Here's some food for thought: Something like that was their normal and they likely had all of these sorted out with relative ease, given that they'd be experts at that kind of living. Also wild food sources were plentiful. Overall they may have enjoyed more downtime than us, who have to do quite a bit to maintain our higher standards of living. Estimates are that hunter-gatherers "worked" around 20 hours / week to sustain themselves, the rest being spend on low intensity tasks or idle time.

Given how plentiful and available food sources were, I don't imagine their life could have been considered stressful in that regard. As a hunter gatherer there's also a specific point at which there's nothing really left to do: There's no point in hunting/collecting more food than you can eat before it rots. No infinite treadmill to run. Nobody who always has "more" regardless of how hard you work.

You on the other hand have a lot to stress out about in modern society, not even considering that if there's any major breakdowns in the systems we have established to feed our massive populations, such as a disease that wipes out the majority of crops, the majority of us will be dead and starved within months if not weeks, with very little individuals can do about it. The planet can always feed a couple of us, but can't feed billions if things aren't operating somewhat smoothly.

I have wondered if animal husbandry played a larger role than agriculture, alone. The horse, as we know it, altered all of civilization.