Oh my, I'm sorry to hear that...it worked wonders for my Bella.
Do you have the seat set up in the back seat or the front seat? Bella started out riding in the front seat (with air bags off) and she did better than in the back seat.
I also noticed that it helped in the beginning
not to feed Bella prior to a car trip. I'd feed her after we arrived to a destination but not before.
Also, as she got older...I think that had something to do with it because now she can ride in her seat next to Abby & Phoebe in the back seat with no problems.
Just in case you are a speed demon...lol...that won't help her tummy either. I drove with my son one day and after seeing how he was driving...it's no wonder his Beagle had tummy issues while driving!
Well, hopefully you can find a way to help your Gizmo...