I have the same “allergy/reaction/ whatever” (the medicos can’t decide on what to call it). BUT, they just give me shot of some anti-nausea stuff and all is good. I’ve told numerous docs and nurses “I need a shot of that anti-nausea stuff before morphine” and every one, so far, have known exactly what I need. Shouldn’t be a problem. (I think it’s Compazine or Promethazine)
Toridol does the best for me.