Have you tried essential oils? I went to a local herb/natural store and got some yummy smelling essential oils.
Mix the oils with an oil (like grapeseed or something soothing for your skin) and put it in some type of container (I got a little roller-ball one). Roll or dab it on your wrists. When you start to feel nauseus you can smell it and it should relieve your symptoms a bit.
If you have a good natural store near you they can tell you how to mix the oils, recommend soothing blends, etc. I like lime with a little lavender and vanilla mixed in.