I'm not sure... Extreme anxiousness due to extreme immediate danger. Also, a person's trauma is depicted through recurring flashbacks of recent horrible events.
Snakes are being experimented on. They're the primary baddies of the movie, but they're still animals whose health is being manipulated for human gain. We're told that some of the experiments have been carried out on other animals as well, such as mice, which killed them.
Jews/Judaism don't come into play in any way. However, I want to mention that there's a scene in which gas (a sedative) is released into a room (where a giant snake is kept) via an established mechanism, which briefly made me think of the gassing of people in N**i concentration camps.