According to the Universal Rider's Guide, these rides should be avoided by guest's suffering from Motion Sickness:
Islands of Adventure:
The Cat in the Hat (spins you around)
One Fish, Two Fish, Red Fish, Blue Fish (the fish go up and down depending on how you manuever it)
High in the Sky Seuss Trolley Train Ride
Jurassic Park River Adventure (water ride in a large boat)
Pteranodon Flyers (two-seater that flies you above Jurassic Park, turns are jerky)
Dudley Do-Right’s Ripsaw Falls (flume ride, he might be able to ride it)
Popeye & Bluto’s Bilge-Rat Barges (water ride in a raft that can spin around)
Storm Force Accelatron (tea cup ride, sort of)
Doctor Doom’s Fearfall (sort of a outside version of tower of terror)
The Amazing Adventures of Spider-Man (3D ride that spins you)
Universal Studios:
Shrek 4-D (this ride has stationary seating)
Jimmy Neutron’s Nicktoon Blast (this ride has stationary seating)
Disaster (subway train that gets bounced around a lot)
JAWS (water ride on boat)
FEAR FACTOR LIVE (not quite sure why though, this is a show)
MEN IN BLACK Alien Attack (spins you around a lot)
E.T. Adventure (mostly jerks you around, you're on a bike, sort of sharp turns)
TERMINATOR 2: 3-D
I left out the roller coasters because I read on your posts that he can handle roller coasters. Hope this helps.
This website has the link to the Universal Rider's Guide which provides all of the information I just gave you!
www.universalorlando.com/hours-information/theme-park-services/ada-information.html