Respected user, hi I evaluated your query in depth .
* 
Domperidone can be taken very safely ( if there is no sensitivity to 
   molecule) for control of 
nausea during GI infection .
   Pan D has to be taken with 2 sips of water on empty stomach morning & 
   evening for desired period of time .
* Orni is also known to give metallic mouth & nausea .
   once its dose is over , within next 24-48 hrs its induced nausea will 
   disappear .
* I recommend certain extra precautions for getting better results
- drink plenty of liquids in sessions preferably boiled water, coconut water,
  lemon juice , butter milk 
- small amount of light diet at intervals 
- avoid prolong fasting / overeating
- avoid oily / spicy / non veg / beverages / junk foods / commercial product
  biscuits , ice creams etc
- avoid 
stress / anxiety
- have sound sleep of 7-8 hrs regularly
- avoid 
smoking / alcohol / any abuse substances if any
Hope this clears your query .
Welcome for any further assistance .
Thanks for using Health care magic & giving me an opportunity to assist .
Wishing you fine recovery from the same .
Regards dear take care .