Ok, I see from this post he is 3 (I asked you on you other post!).
Poor you, P'mum. It sounds as if the whole thing has got completely 'worked up'. My DS won't eat jelly or anything associated with jelly since he choked on a piece of fruit in some. I haven't bothered to tackle it as jelly is so unimportant - but i do know now how powerfully these things take root in their little minds. And not surprisingly: how else do they learn, but by experience!
I think in your position, the first thing I would try would be letting meal times calm down again - even just serving chicken and chips in a relaxed manner, if that's what it takes!
Then, away from the context of food, and not when he is at the table, or eating, I'd have a conversation about his fall, and explain that it was the bump that made him sick, not the food.
Then , very casually, and with no persuasion or cajoling, I'd try very gradually introducing things which he might not associate with the sicked up dinner - would he eat pasta? Does he eat puddings (which anyway you can lace with fruit - a perfectly acceptable substitute for veg).
Would he start to eat other foods in a non-dinner setting? A picnic? Soup?
But the main thing is to try and take it away from any sense of 'battle'.
You've probably tried all this - sorry!