Ate pizza with pineapples on it.with no red sauce (avoid because of ulcers). i feel nauseated with belching, what can i take? no vomiting.

Many good options: My first recommendation is the homeopathic remedy nux vomica, widely available at health food stores, which usually works wonders when you eat something that doesn't agree & is worth having on hand for future use, but you probably don't have that around so you can try 1/8 tsp of baking soda in water, ginger tea or pepto-bismol. See http://www.Earthclinic.Com/cures/nausea.Html for more ideas.