Maybe you could start by gliding to try and get used to the sensation? Its alot cheaper than powered flight and your instructor isnt sitting next to you (he's behind), so it would be a little less unpleasent for him. You can also buy special bags that absorb the smell and wont spill.
If you find flying is not for you, at least you would have most of the cash to pay back to the bank. I know of people who have paid for one of those 28 day PPL's (abroad), spent the first few lessons being very ill then going home with not much money back.
Best of luck to you whatever you decide.
