Unfortunately there are a lot of rides at Epcot that could be an issue. Are screens usually an issue for you? Here are my opinions on how each ride may or may not affect you:
Test Track: probably not a good fit. There’s sudden turns and braking and also a few screens
Mission Space: nope. Everybody gets at least a little motion sick on this one lol
Guardians: not a good fit. You’re spinning the whole time
Spaceship Earth: probably fine. You have a little screen in front of you and there’s maybe a couple others but it’s a nice slow relaxing ride
Nemo: unless screens really bother you you’ll be fine. The whole ride is screens but you’re barely even moving
Soarin’: may be an issue. It’s all on a screen. There’s a little dipping and movement but nothing sharp
Living With the Land: I usually skip this one but I think you’ll be fine, it’s a slow boat ride with maybe a screen or two if I remember right
Journey Into Imagination: similar to Nemo
Gran Fiesta Tour: I think you’ll be fine. It’s a slow boat ride with a few screens but you don’t have to pay attention to them
Frozen (spoilers!): I think you’ll mostly be fine? There are a couple screens but not too bad and you don’t necessarily have to pay attention to them. There are 2 parts I would be concerned about: the first is (spoilers) when Elsa shoots you backwards for a couple seconds. And the other is the drop. Maybe watch a
YouTube video of it to get more of an idea
Ratatouille: I’m thinking probably not. It’s all screens and a fair amount of movement and twisting around. Not nearly as bad as others but could be an issue
Hope this helps! Lmk if you have questions on anything