Hi Nick,
First of all, stop trying to feed the snake temporarily. If it has already puked twice, then its GI system is already pretty screwed up. Regurgitation in snakes is a big deal. After a few times, the upper GI system is usually screwed up beyond repair from stomach acid that is burning the esophagus. I would wait several weeks before attempting to feed the animal again. If you feel that it is too thin to last that long without food, then it probably is not going to make it anyway. In the meantime, take the snake to a good herp vet and see if it has a raging bacterial infection of the GI tract, or if it is the beginning of cryptosporidium. I also have heard of the association of crypto and a hard abdominal lump, not a soft lump, but in reality you won't know until a vet takes a look. If the swelling subsides in a few weeks, offer the snake a very, VERY small meal. If you offer it food to soon, or if you offer food to large, the animal will surely regurg again and will in all likelyhood die.
You said that the temps were the same, what are they? They really shouldn't be the same as summer temps under normal conditions, as the air tends to be cooler and dryer in the winter time. I don't manipulate the heat pads or room temperature in my snake room in the wintertime and all of the areas within the cage are cooler except for the area on top of the Flex-Watt. So check those temps again and let us know. good luck.
Will
