I would imagine a lawyer at any of a number of the nations larger law firms would take this on for you on contingency given the rather large sums that McDonald'

I would imagine a lawyer at any of a number of the nations larger law firms would take this on for you on contingency given the rather large sums that McDonald's might be forced to spend settling this with you. These firms are pretty approachable - don't go the local small-fry ambulance chaser, they won't know what to do.