Prob a bit late in the day to say get ur shoes checked etc. Assume you re looking for divine intervention for Sunday?
With no idea what the problem is its difficult for anyone to answer.
Personally I would not do anything until Sunday, RICE . Maybe ibuprofen gel? or what works for me better than most things is the ice/heat thing, as it gets the blood to rush to the area to speed up healing. Then get onto the start line and see what happens. You can always pull out.
This is just what I would do personally, am not a doctor but know what it feels like to have done all the training and then have an injury so close to an event. If in pain before the day just walking I would not run on the day.
I had inner knee pain a long time ago and it was actually due to weak glutes (may wanna get things looked at professionally after)
Good Luck