@ZipLine-- I had the same problem with oxycodone. My doctor had me reduce my dose and increase it more slowly. Taking a high dose suddenly can cause more side effects.
I also usually eat bland food when I'm on opioids. I eat foods like bananas, oatmeal, rice, applesauce and mashed potatoes to help settle my stomach. Ginger is also great for nausea. You can buy ginger candies from health food stores.