Oh Frogga,
Poor you! Are you sure the NHS isn't using you as a test-pilot for their experimental models? Do you have to get the chair transported again, like last time, what a bore that would be!? Won't the wheel on the manual just screw back on, or has something actually snapped - (you don't have to answer these questions...). maybe the uni health department can fix you up with at least something to wheel you down a corridor and back ... change of scenery.
Anyway, I *really* hope you can get something sorted out - I know how busy you are!
all the best.