After reading all the comments, I'm surprised the BA flight attendants on my first flight didn't respond differently. Honestly, nothing was said to me, and it seemed they just wanted to get me off the plane (I don't blame them for that!)
I would have thought that, at the very least, they would have called ahead for a wheelchair.
Frankly, when I spoke to the airport official, I really thought I ate something that didn't agree me (putting it mildly) and that I was fine. I guess he was convinced!