Treadmill

So I took off a week after my last run to let me legs recover. Nearly every day I've had some weird pains and such, but for the most part today they felt pretty good. I got a break at work, had some energy and wanted to get a run in. I decided to stick to the softer surface of a treadmill instead of an outside run. Things went pretty well until 20-25 minutes in. Started getting soreness but no real 'pain'. Then : bam : a pain shot through my right calf. I've never experienced calf pain before. I have no idea wtf is going on. I think I'm going to make a trip to the doctor just to get his opinion. I'm more angry and annoyed than anything and I'm inclined to say f-it and run through the pain.