I have vertigo, I can get dizzy and queasy easily. I did Mission once and my day was ruined. I hate Primevil Whirl.
Star Tours I prefer the back so I can take it all in without too much head movement because it kicks in then. FoP I was concerned but found if you move your head not your eyes it changes everything with the dizzy.
We did MF twice. Once we had pilot but traded for engineer. Second time gunners but traded for engineer. I was worried since we needed to participate looking to our sides, my kid was across the aisle and I was trying to film it that for sure I would be sick. We had on seat belts and we bounced about. More like bouncing up and down and left to right ... the better the pilot the smoother the ride. First pilot was great and so our ride fairly smooth. Second pilots were younger and hit lots of stuff so our ride was rough.
I am shocked I didn't get sick with pushing all the buttons, yelling over to the kid trying to tell him what to do, filming with my right had and bouncing about. There was lots of air blowing but there also is on FoP and felt about the same. I felt like being further back in the cabin I could see all without too much movement of my head and it was wider back there so I didn't feel closed in. I can safely say everyone should try it once, it's a great ride (and I had my doubts), so much fun.