@Soupe du jour - thanks for your comments about my husband. He will follow up with a different doctor. I also read that marijuana can stop vomiting (and also cause it in high, prolonged doses but that is another issue) and I read on several reputable medical sites that the brain system involved in Cyclic Vomiting Sydrome is the endocannabinoid system. Since my husband smokes a tiny amount every few days anyway (it's legal here), it seems worthwhile to try if he gets the vomiting again.