my wife got me one of these flights. I have gone up prior in a Cessna 172 twice prior but when I went up in July around 10am.
It was very humid so there were thermals. I was able to taxi and take off but maybe after 20 minutes in the warm humid air I thought I was going to get sick :P
Had to crack the window and he gave me his barf bag just incase. When I got back down and drove back home even going over hills gave me that same sick feeling
(hurl)
I'm not a fan of roller coasters or hieghts but had no problem prior or in big planes. Just the raise and pitching like being out at sea made me feel like total crap.
When we got down the instructor told me he had a lady come over her airsickness but I don't think I'll try to fight it.
What a bummer, hope you go all the way ;)