Tom - any update on this? How are things now? Did the pain come back at all?
I've currently got a recurring injury with my Achilles - every time I run a marathon I stop and a bruise forms on the back of my Achilles tendon, last time I couldn't walk for three days at all.
I think sitting around is your only option. I had similar problems before a marathon, ran the race and it's the worst pain I've ever experienced, especially after. It took me a week to be able to walk on it again and over a month with no exercise other than walking and light stretching before I was able to start jogging. Ibuprofen should help, but as Mr Puffy points out - if it's torn then that's quite different from if it is tendonitis.