My wife and I started developing motion sickness a few years ago. We found Sea Bands:
http://www.amazon.com/Sea-band-Original-Wristband-Adults-Pair/dp/B00DKEPFV2/ref=sr_1_1_a_it?ie=UTF8&qid=1464980270&sr=8-1&keywords=sea+bands
When we took our boys to Disney, we wore these all 8 days and had no problems.
Now, we did find out that we can't do spinning looping rides one after another. We went from Firehawk to Flight of Fear a couple of weeks ago and had some trouble. But, after figuring out what we can/can't do right after each other, we are good to go!
Hope this helps!!