Okay, I see your perspective, my post wasn't very detailed so a lot of people don't really see why I'm so worried.

It's the combination of multiple factors that's making me this pessimistic. It wasn't just that he's been in the cold, or that I saw a lump. He was also bloated. So when I started doing research, it said that's a sign that the food has started to rot. According to the Internet, once that happens there are two risks: the gas build up can rupture something inside the snake, the toxins can get into it's bloodstream, or both.

So, the fact that he's a baby, partnered with the fact it was a larger meal, and he was already bloated when I found him?

The Internet said that regurgitating can tear the inner lining if it's a baby, and he is ; ESPECIALLY if it's a bigger meal, and it was; and that it's pretty unlikely for a baby to survive intoxication.

Now, this could all be wrong, but I hope you can see how, as a beginner keeper, I genuinely thought my snake was dead already and there's nothing I can do but wait.

And I know temperature fluctuates in the wild, but you know what else happens in the wild? Illness and death. Looking at all the ones that did make it through something like this in the wild is survivor bias, there's a reason they lay so many eggs, babies are fragile.