Bassmaster - Nausea is your body telling you something is wrong. Blockages/partial blockages are serious conditions that may not show up in your blood work or urine specimen. Keep a watch on your temperature. Inability to keep anything down, bile (greenish matter) in your throw-up, bloating with no gas, constipation -- all signs of blockage/partial blockage. That may not be it at all, of course, so in any event - go to the emergency room if you're still nauseous.