Acupressure seemed to help my son a little bit. There is an explanation of it here:
http://adam.about.com/encyclopedia/Nausea-acupressure.htm

My son's "graduation gift" from the RO nurses at his last TX was a throw up bucket and I wish he had gotten it at the start. You can stick some smiley faces on it and put paper towels in the bottom. (easier to clean up). Don't know why I hadn't thought of it sooner . . I guess I was afraid he would look at the bucket and it would trigger the nausea. I used to have towels and tissues in the car and lots of water and gatorade for him.