Thanks for the replies and for sharing your own experiences. As for my own injury, it's not too severe at the moment and i will be resting it as much as possible and using ice packs. I can't rest it completely as i coach 3 times a week but i'll be making slight changes to the sessions so that i don't have to play too much overhead as that is when i'm not doing it any good. The plan, as Dano suggests, is to strengthen it in the gym once it has recovered enough to do so.
As dotdot mentions, it is one of the most common badminton injuries. A lot of people play through the pain for months, even years and end up with tears which then need a fair bit of treatment but those that rest it early enough seem to recover well.
And ouch ethan; that sounds painful. That minute must have felt like a lifetime!