Kathy-I'm glad to hear your ulcer is being treated, it's going to take some time for it to heal and this might be what is causing nausea. Double check to make sure you were checked for a stricture, it doesn't hurt to ask. Keep a log of what you eat and of those foods make note of the ones that don't make you nauseated so you know what is easier on you. Dehydration also causes nausea so make sure you are getting enough fluids.
Make sure to keep us updated on how you are doing.