Anti-nausea medications: What else is there?? Not working....?

Hello, I have been having problems with nausea nearly every day. Sometimes it gets so unbearable that I can't eat for at least a few days and if I drink anything, it has to be lukewarm, I have to sip it and I have to remain motionless for at least an hour to keep it down. I have had tests on me and they found an ulcer on me back in 2008 which I am pretty sure is no longer there as my last tests showed, but I still take Protonix daily. When the nausea gets unbearable, I need something more, though. I have been put on Zofran, didn't work. I have been put on Phenergan, oh my Lord I hated that. I continued to be nauseous but had a stabbing feeling in my stomach and the nausea actually got worse. Plus, both meds gave me the worst dry mouth ever. I've tried so many OTC things that do absolutely nothing to help. What other medications are out there that I can talk to my doctor about when I see them again? I had a gastric byp years ago, which makes my stomach more sensitive. I am 26, female.