Thank you for the query.
You should not worry so much. Removing both organs at one time is a very good idea. There will only one incision (in the middle of your abdomen). Nowadays, after a surgery patients usually do not feel any pain as we have great medicines. So you will be under anesthesiologist care and every pain will be eased with medicines. And so is with nausea
So do not worry. Both procedures are quite easy to perform. Just need to take a little more time than a single one.
Hope this will help.