Ugh!

Thinking that's pretty much all there is to say about today's workout. I'm not sure what the deciding factor was, but I'm sure there were several contributing ones. It was actually a warm, sunny 75 out today, and when you factor that in with the rain we've BEEN having recently, it adds up to humidity. Then, there was the fact that we decided to run PP Hwy (of the hills), and go in a little further than usual, so our out-and-back course made 3 miles. Little did I realize that last half-mile in was all downhill. Which of course translates to the first half-mile out being all uphill! I hadn't done anything physical in 3 days (life will get in the way from time to time), so maybe my legs had gotten lazy as well, but as I turned around and started back up that monster of a hill, I realized that it just wasn't going to happen. So. . . C25K w8d1 probably goes in the books as my biggest FAIL so far. I made it 20 minutes (about)--that's 15 minutes running before I tossed it in. I tried running again after making it back up the hill, but my legs were KILLING me today. Still waiting for this to stop hurting, at least this much. Even the walk back to the car hurt most of the way. It almost feels like I'm losing ground rather than gaining it. What am I doing wrong?