Hello JM and welcome!
You have hit the nail on the head.....I too, have chronic nausea. It is horrible right now and all the docs want to say is "well, it's probably from your ms"! I take zofran 3x day and phenergan when the zofran doesn't help. My Gi doc thinks it goes with my chronic constipation but I'm not convinced of that.
I just returned from seeing my internest for this same reason. He is sending me for a "gastric emptying" study. He said MS can slow your digestive track down. I have to eat something with the radioactive stuff in it then they will scan me, it takes about 4 hours.
I agree with uppity about the natural supplements, some of them are not good! Also, poeple with mS should not take immune buliding supplements at all.
Take care and keep us posted.