I have never been nauseous on rides, but FJ was one of the first to give me a touch of nausea. I've been on all the other simulators (soarin, body wars, star tours, simpson, jimmy neutron, spiderman etc.) The simulator parts in FJ are fast moving and sometimes blurry which is a bad combination. If you close your eyes when you start to feel it coming on, you should be alright. The ride movement itself is not too bad
I was really looking forward to riding it, but within seconds of it starting I felt a wave of nausea come over me. After about 30 seconds I felt like if I didn't close my eyes, I was going to throw up. When I got off the ride I was in a cold sweat and shaking. I felt terrible for about an hour afterwards.
In fact, when I was there last August/September solo I was staying on property and made early entry every morning just to ride FJ. I used the single rider line and would ride it 7-10 times in a row every morning. The CMs got to where they recognized me and said things like, 'How many times are you going to ride it today?"

