I have some type of roundworm, and I have felt what I'm certain was something trying to come up my esophogus. I never had it almost cut off my breathing though. That almost sounds like an allergic reaction to something.
I just saw a youtube video the other day with a medical case history listed regarding a woman who had candida in her throat. She had swelling, trouble swallowing and felt like she could not breath. They did an endoscopy thinking she had cancer, and it was candida.