I'm not a runner...nor do I know much about knees (other than my particular problem, which is not the same as yours!)... Your doctor will be the best one to advise you on that! But you can certainly ice it until you can get in to see them!!
"RICE" is the old standby: rest, ice, compression, elevation. Not knowing if compression is a good idea, I'd stay away from that until you discuss it with a medical person., but the Ice, Rest and Elevation are definitely within the realm of home care. Other than that, no one here should really advise you on this....
Hope your doctor can see you ASAP! :) And that you recover well from this. (Don't worry about the 5K...if you can't do this one, there are Always more!!) Better to get properly healed.
PS Welcome to Spark People!! Its a wonderful site here...so much good information, lots of advice from experts (not just folks like me--but, real, educated ones!!), and a really supportive community. May your journey to a healthier life be a good one!
Edited by: LADYSTARWIND at: 5/22/2013 (23:47)