Hi Michael,
I also took Emend plus Zofran and, I believe, Decadron (at least I know it started with a "D"!). Anyway, although I felt nauseaus for a couple of days after chemo infusion, I never threw up. Keep asking the doctors about different meds. As you can see, each med works differently on each person.
Good luck and hang in there. It's a rough / tough battle, but one worth going through!
Hugs, Nancy