I had the same thing, I'm glad it's not just me. I had this zany idea for a while that the intestinal parasites create a bubble of gas (ammonia?) when something passes through that they don't like, like Clarkia or parastroy, so it stops the stuff from touching them. I have had the same reaction to raw onions since this started, when I never had this reaction before contracting worms. It's only now that I find out from this site that onions are a worm-unfriendly food.
I ahve no evidence for this, but it's still an interesting idea.
I agree with hopinso that you need to make sure you cleanse these worms out. That's why I started a Bowel Cleanse as well.