<human>: A little background: 
A few weeks ago, I finished the C25K program. Initially, running was simply a means of losing weight and getting in shape, but each week I found that I fell in love with running more and more. It was hard, but I finally got to the point where I was running 5K happily and effortlessly every other day; and was able to maintain my form at 6mph for the duration of the run. 

However, about a week ago, I took about four days off due to a minimal amount of pain in my left shin. I have a pretty rational fear of shin splints, so I thought it best to baby the injury before it progressed to something debilitating. 

I figured I would have lost a very small amount of my endurance, but nothing that I couldn't regain after a couple runs. So when I returned, I went back to business as usual. As I ran, my form felt scattered and awkward and I couldn't seem to find a comfortable pace. Then, not only did by left shin *really* hurt, a sharp pain began radiating from mid-foot, all the way to my hip (right leg). The most extreme pain being in my right knee. The pain became so much that I had to stop. And never during the entire C25K program did I ever have to stop or cut a run short.  

I made an appointment with my GP, and expect to be told to take [at least] a few weeks off. So, I'm feeling pretty damn discouraged. I worked my ass off to be able to run a 5K, only to develop an injury that will negate all my hard work. 

I guess my question is: *How much training will I lose, given I only have to take a few weeks off? And how the hell am I supposed to stay sane if I don't get to run regularly?

Could you distill the essence of the text into 1-3 sentences?
<bot>: Finished C25K and was doing well, but soon developed an injury. Wondering how much training I will have lost after rest/recovery.