Oh no! Tried running on the treadmill today and had to stop after 12 minutes because my left knee started to hurt. I stopped and stretched and tried again, but still felt bad so I gave up. I was too scared to carry on.
I'm going to go outside tomorrow and see how it is then. I did have two rest days since my last run so I haven't been overdoing it. Just not sure why it's playing up, and I'm feeling gloomy and concerned.