For Shockwave, yeah that happened once I got to the 3rd loop (It's loop after loop after loop). It really was bad one day after I just got a really bad headache after going on that ride more than once. This probably was a dehydrated type of thing, but after that, I doubt I ever went on it again. Literally, liquids could make or break a ride. If you have 1 terrible / bad experience from whatever ride, you might blame it on the ride, and not on your body at that time, and never ride that ride again.
"I've been staring at the world, waiting. All the trouble and all the pain we're facing. Too much light to be livin' in the dark. Why waste time? We only got one life. Together we can be the CHANGE. So go and let your heart burn bright"