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Critters chewing their leg off is a myth. When the blood flow to the extremity stops, the limb becomes completely numb and in the process of biting the trap the toes are sometimes bitten off.

I mentioned the neck type snare as alternative to leg snare IF you were going to use a fishing line/ cord instead of a wire snare.
Q critter could chew thru a para-cord/fish line, if it could reach it.

I like the anise oil idea, combined with a neck snare. You could use a heavy dead branch rigged with a " trigger" stick, dead-fall style instead of a springy branch if that wasn't available.

I agree with Mad Mat, you can go along time without food. If you can stay warm and hydrated, that will keep you alive for a long time, especially if your staying in one spot. Having a 24/7 fire and some green boughs for signal smoke will help as well.

The majority of the world gets it's protein from insects. Kick over any rock/log and you'll find something to eat. Just hold your nose and swallow whole without chewing ;) Lack of protein will make you mentally disoriented, more than lack of carbs.

If nothing else, rigging snares/keeping the fire going, will keep your mind from wandering into the " negative" zone. Once you lose hope, your a goner :(