Open the windows for some fresh air. Avoid making foods that will produce a strong smell in your home, like brewing coffee, frying meats or fish, or cooking spaghetti sauce or chili. Do not lie down flat for at least 2 hours after eating. If you wish to rest, sit down. If you must lay down after eating, prop your head up at least 4 inches higher than your feet.
Some medicines cause nausea.
If possible, take them at a time of day when nausea will not interfere with meals.