Do you feed live rats, pre-killed, or frozen/thawed?
If you use frozen/thawed rodents, it seems quite possible that the first regurge could have been caused by an improperly thawed rat (either too cold in the middle still, or too cooked during the warming process). Subsequent regurges can be caused by the first, as mentioned earlier. They need time to rest, heal, and replenish after being sick.
If you feed live, (or pre-killed immediately before feeding) then I don't have much of a guess as to what caused the first one. Maybe the rodent was simply too big, although it'd have to be pretty darned big (relative to the snake) to be rejected by the body so long after having been eaten.
If I were in your shoes, I'd give the snake a full month off from eating. At that age and size, it should be able to skip a few meals without any adverse affects. They don't become emaciated in a moment. It's more likely that it simply appears that way because it's not feeling well. I'd keep an eye on him, make sure he always has fresh water available, and the environment stays clean. After a month of rest, offer a small meal and see if it stays down.
During that time of rest, if the snake really does seem to be losing weight, I'd consult with a vet.
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