Thank you for asking this question!
I am currently a student in a NYC EMTB program. I go on my first and only (thus far!) ambulance rotation in a little more than a week from today.
I've suffered from various stages of motion sickness in the past and it dawned on me that assuming I don't have a nervous stomach for anxiety reasons (a nervous newbie on a bus? LOL!), I need to consider motion sickness, too! I mean I literally get motion sickness (but not vomiting, just usually dizziness, sometimes headaches, sometimes nausea when it's bad) simply by riding the bus (I usually ride the subway and I don't have motion sickness on trains, ever). The one time I was on an ambulance years ago (I was accompanying the patient), I remember feeling *woozy* ... embarrassing, heh, but I survived the ride without becoming Pt. #2, heh.
Meanwhile I'm going to get some Dramamine and test it on myself during this week, with the hope that I don't motion sickness. I've taken it in the past and it makes me drowsy sometimes, but I'll see how it goes. If it doesn't work, I'll try those acupuncture bands and other techniques.
Again, thanks for asking this question and hope your motion sickness improves!