Try Bonine instead of Dramamine--lasts longer, and no sleepy side effects.
We've been before, and are going back in a couple weeks. Motion sickness is high on my list of concerns. Everyone's different, which makes it tricky to give recommendations. For comparison, I was really sick after "Star Tours"--had my head between my knees and was wonky for the rest of the day. The rest of my family was fine. A few of us typically get motion sick (me, DD15, DS13).
I didn't do FJ on our last Universal trip (10 years ago!), because we were doing "rider swap", and the ride was too intense for any of my family to want to repeat it right away. I hope to do it this trip, along with the "swap-ee"--that would be our youngest, he's now 13 and 5'8", so I think they'll let him on.
I got sick on Jimmy Neutron (now Minions), and the Simpsons. DD(now)15 had no problems with either. OTOH, I was fine on Spiderman. I will be trying Gringott's this trip,a s well. I don't do coasters any more wild than Big Thunder, so I'll be skipping Rip, Ride, Rocket and Hulk. That's me being wimpy, though, nothing to do with motion sickness.