I know this belongs in the health forum, but I need the help quickly!

My fur-brother chance (a ratty)  apparently got into my sister's chocolate stash.  She says he ate two squares of a hershey's bar the AM before school, and then 3 more squares later that night.  He had the hyperactivity, throwing up and a slight fever that first night, and they took him to the vet the next day, the vet said he was fine, but this puppy is still throwing up.  He is pooping, so he's getting some through, but he throws up a few hours after each meal.  I need to know of those lovely rattie throw up helpers that you all throw out!  I searched and could not find them.  My mom has to go back home in a few hours, so I would like to help her out before she leaves.  Chance is fine in all respects except the sensitive tummy now, he and Rocky are full bore as always

Thanks for the help in advance, and it's good to see everyone again!  I've ben gone too long!