I feel for your story and can sympathize. I eat something bad one night and had to fly the next day from CDG to SFO. It was the worst flight of my life. It was one of my first ever business experienced back then. Really looked forward to the trip and then couldn't eat or drink anything also. Since then decided that I would never, ever fly again when being that sick.

It also surprised me that BA didn't pro-actively called for a medic at arrival. Sounds like they really should have.

Anyways, one 'hell' of a trip indeed