Knee pain

When I finished the interval run yesterday, I had a pain in my right knee. I thought (hoped) it was just fatigue from the hard training. By evening it was gone, so my theory seemed right. Unfortunately, however, the exact same pain came back half an hour into running today.

Now I have a difficult choice to make. Naturally I don't want to aggravate it - there is only one month left before the Loch Ness Marathon. So ideally I should rest until this pain will be gone, but I don't know how long I will need to wait and this is very unnerving for runners.

What should I do? For the moment I pray the pain will be gone by tomorrow.

Today: 8 miles
This week: 29 miles