Well that's good to know that in time it got better!
On my last lesson, the instructor banked the helicopter so hard that my palms were soaking but I think it was his way of showing me how steep these aircraft can bank without problems.
The strange thing is that I looked for something to hang onto which is in itself stupid because if the helicopter did topple over, me hanging onto the door handle or seat base isn't going to make any difference at all!
This makes me think that I actually have the 'fear of falling' rather than 'vertigo' or the 'fear of heights'!