Ouch!

I have found the new hobby of running. I started several months ago only running a mile at a time and have built up miles slowly. Up until last week I was running 3.5 miles a day & have never felt better! I was burning a ton of calories & enjoying it! Last Tuesday, out of the blue my right knee started hurting... it didn't start hurting in the middle of a run, just that evening. Anyway, I am really bummed that I can't run. I have been walking at the gym, but it's not the same. I never would have thought that I would be saying that I missed running!!! It is feeling a little better today, so I'm hoping I didn't do any major damage & can get back on track soon. I know, very random posting... just had to get it out.