no you don't!!!!! hugs for you- sounds like a really tough couple days.
and something I'm slowly learning myself- we don't need to apologize for things that aren't our fault. and its ok to stand up for what you need. not easy, uncomfortable, and takes lots of trial-and-error.... but you will feel better about yourself and the things around you.
and Good for you for doing the teaching job- even on crutches!!! wow! I'm glad it went pretty well and that you have ideas on what to do next time. that's great!
(and paying the rent has got to take precedent over the volunteer job- I'm sure when you have the time and the ankle back, you will continue to do good works in some form.)
now REST and take the medications!!! and try to stay off that foot.......
did I say one project at a time?