Major problem with exercise

I've been running every other day for a month now. The standard that I set after the second week is jogging/running for 1.4 miles and walking in between when it gets too tough for me. A few days ago I started getting the feeling that I couldn't run past .5 miles... I would just start walking. It's like my body gives out and I can't run like I used to. Before I used to be able to run practically the whole thing, now I can't even make it halfway. What gives? Anyone else have this problem?

Stop sitting at your fucking computer posting at 4chan.

Your body needs rest. If you have ran every other day for a month, I betcha your muscles are yearning for a break. Give yourself 48 hours to rest up, and then start your regime all over again. And do this every week or so so that your muscles can get a rest from all the strain.