Try switching him to a small/medium rat (around 80 grams) every two weeks (after he sheds). Although non-breeders don't need to be fed every week, it is inefficient for him to eat an enormous meal only one a month. Large adult rats can also be much more dangerous to your snake if they feel threatened than a smaller rat. It's past the time of year that males would typically go off feed (or near the end of it), so he is probably just still digesting that huge rat. Feeding him smaller meals more often will allow him to have more evenly spaced nutrition, and not be as uncomfortable for days after eating.
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