Hi Lyme - fair enough. Lurking Fear bills itself as simulationist horror, so an instant return to full health after being shot a couple of times (or what have you) had me raising my eyebrows. I think I will house rule that hit points return at 1 hit point per night of rest. Or perhaps a return to full hit points per the rules as written, but all physical acts are at -30% the next couple of days to account for lingering effects. Cheers!
It's a bit of a weakness of hitpoint systems. A common response is to view HP as representing fatigue and minor injuries that gradually weaken a character until, at zero hp, they finally take a truly dangerous injury. In practice, I've never seen a player or GM resist the temptation to describe attacks that reduce HP as causing serious trauma to the flesh. Still, HP is a feature of most older d100 horror games, so it needs to be a feature for maximum ease of compatibility.
I am working on a more modern horror system that will not use HP at all.