Bev,
I am so sorry that Gus is doing poorly today. I would tend to agree with Sienne and Marjorie. If he is still vomiting frequently, he may need to be in the hospital where they can monitor him, get him on IV fluids, and aggressively manage his pain and nausea. My kitty, Teddy, was a chronic pancreatitis kitty, and during one very bad episode he was in shock with very low body temperature by the time I got him to the ER. A sick kitty can go critical quite quickly if he is fighting pain, nausea, inflammation, and likely infection. Electrolytes can get out of balance in a vomiting kitty. I agree that Cerenia would be better in this case than Reglan. Maybe the new antibiotic the vet gave (did you get the name of it) will kick in, but Gus may need a bit of extra support to get him over the hump. You have done a fantastic job of caring for him. I know it is very stressful to be caring for a very sick kitty. My prayers are going out to you and Gus.