Leave him alone for a week or two then offer again, if he/she refuses that's fine, most likely still stressed out. In the meantime correct any husbandry errors if there are any and next time make sure the snake completely feels secure while eating.
When feeding its recommended not to handle the snake a day before feeding and two days after feeding. The day before feeding is to make sure the snake is not stressed before, so it will eat the next day, this is specially if you have a picky eater. The two days of no handling after eating is to give it time to digest, specially after a giant meal. If you handle too soon while the snake is still bloated and feels vulnerable to attacks as it is slower, it will regurgitate to be more mobile and agile preparing for defense against attackers.
But be sure to correct this as soon as possible because regurgitation really makes snakes feel completely terrible, weak, lethargic, no appetite, etc.
About the fast breathing, wouldn't worry about it, you probably just have a nervous snake.
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