Bro, dont do anything to numb your knees, if there is pain they are telling you something. and I wouldnt get hooked on any kinda of pain killer/anit-E either, but ice is a good idea
what is the reason you have to run?? if there is no reason, then pick a more low-impact cardio exercise like bike, stair master, etc. better treat your knees good, your going to need them for awhile
just my .02 though, I am not a doc or anything