My husband is taking Cymbalta (90 mg/day), Trazidone, fluoxetine, Xanax, and various asthma medicines. He also takes Ambien to sleep. Lately, he s been complaining of near-constant heartburn, abdominal pain and nausea, and has been waking in the middle of the night vomiting (I mean, he s already retching before he wakes). The Trazidone and fluoxetine were added recently, but he had this problem sporadically prior to that. What could be causing the somnambulistic vomiting?