OP, hope you are feeling better now, can fully empathise with your need to rant, even though you were of course BU and know in yourself that you should have taken a cab. Incidentally, if there was anyone else in your office late with you and they did not insist on calling you a cab, THAT is the cunt right there.
Like many other posters, am not sure what you wanted others to do for you. My default reaction to someone crying would be to give them privacy by NOT approaching them as I'd assume they were embarrassed about not being able to hold it in. And really, what can a stranger actually do to help?
( That said, Sophie Dahl was model scouted by a top agent who happened to see her weeping on a doorstep in Bond Street after a tiff with her mother, so if you are very beautiful OP, I suggest you do all your crying in W London from now on
)
As for the limp, as long as you were actually walking and not collapsed in a heap I'd assume that you had a disability that looked bad but was not an impediment to your independence, and feel that it would be patronising and rude to comment on it.
As to the general manners of Londoners on the tube, I now live in Hong Kong after 12 years in London and cannot tell you how much I miss people standing to the right on escalators and allowing passengers to exit the train before they board. Here, people barge straight on and do not seem even to SEE people trying to get off, despite public announcements in 3 languages and big red arrows on the platform telling them not to do it! The only people I ever saw do that in London were Italian teenagers on school trips, whereas the "stand back" commuter ballet on the rush hour tube is a delight to behold.