"Bladder" go see yr local Dr. The advice here although maybe helpful maybe totally useless if you have a bug in yr tummy. I had a friend many years ago that was going from LAME to Flt engineer as they did many years ago so he wanted to do a bit of flying before hand. He was never too keen on actual flying anyway. Just as well we did it 'cause not long after becoming airborne he was sick as ten men!. We did this over a few weeks going up trying to get him used to it. Calm days, rough days, ate little b4 hand, took all the usual advice as mentioned here to no effect.
End result?...............he went to his local Dr & found that he had a stomach dissorder/bug that was causing the motion sickness & that was taken care of. Now he's been flying as an FE for over 20 yrs.
Best cancel all doubts by making sure yr quack can pay his next installement off his Porsche by way of a visit !
CW