It's easy enough to DIY, just to see whether it works for you before you pay for someone's time, or those magnetic dot band-aids. The point is about three fingers' width from the crease of your wrist on the inside of your forearm. You'll know you've hit the spot if you press down and feel a kind of bruisy, zingy sensation.
Try pressing 20-30 times at one-second intervals, when the nausea hits, and see how you feel.