Rest and cold compress is always the best you can do for your knees.
I have had repetitive knee injuries over the last 3 years and pain killers are not the solution... Yes they make you feel better but do not get hooked onto them...
Make sure you use an ice pack after every .. I mean EVERY workout.. how ever small and low impact.
Also, if you are running outdoors.. try using the turf more than the sidewalk if that's an option.
I would also suggest seeing your doctor and figure out if you require physical therapy.
In the mean time...ICE is the mantra..
All the Best!!
Disclaimer: I am not a certified physician but have had knee injuries that keep troubling me every now and then.
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