The treatment for pancreatitis is IV fluids and pain control, so I'm surprised your vet sent Tux home. Pancreatitis can change dramatically in a hurry. Its not a bacterial disease, so antibiotics are more to make us vets feel like we're treating something than actually doing any good.
I've seen everything from dogs that were 100% better in 24 hours to dogs that died despite every possible known treatment (plasma transfusions, etc.). Pancreatitis is unpredictable and all too common. When mild, its no worse than a stomach flu, when severe, its deadly.
Low fat diets are the long-term preventative/treatment of choice. If you aren't a fan of prescription diets, you may need to get a nutritionist to help you create a home diet.
Here's a great link, please note that the recommendation to withhold food for 2-3 days is no longer an accepted treatment method. Feeding is recommended as soon as vomiting has subsided.http://www.VeterinaryPartner.com/Conten ... C=0&A=2214