Dear CGail -
If you had a problem with certain foods before, you will have problems with them in the future, maybe worse. Definitely skip the sodas. Gas is pretty awful to deal with after a wrap, at least for the first year, maybe forever if they do it tight enough to work properly. Food sensitivities DO NOT go away just because you have surgery.
If you've had a problem with some particular sort of anesthesia in the past you have to let the anesthesia dept know in advance, like today. Don't wait until the day of surgery. If you're just worried in general, they'll help you if you tell them when you go in. Ask for something for anxiety as soon as possible.
Don't try eating anything ahead of schedule. Stick with broth and gelatin for several days. Don't add Boost until doc says to.
Ask for, demand meds for nausea before you leave the hospital. Put this on a list of things to do before you go home! If you vomit and wreck your wrap at home it's too late to call in for a med.