I will vomit if I try to eat a vegetable

What should I do if I want to start eating healthy...
But whenever I smell a vegetable I can't help but choke? If I eat a vegetable I will vomit, no joke.
I once got my ass beaten for vomiting in the kitchen sink twice when I was five after eating vegetables.

Vegetables are the only things that will make me vomit, not carsickness, not rollercoasters or heights. Just vegetables.