It looks like I have made up for last week's set back. Strangely enough, I'm at the same exact point I was two weeks ago. I was able to increase the speed of my intervals to 10 mph, so that was a personal best. I'm not sure how fast that treadmill goes, but I have to be approaching its upper limits.
As for my workouts, I decided to start using the weight machine at my apartment complex. I felt like I needed to be using more weight and some of the bodyweight exercises weren't cutting it anymore. I'll try it for the rest of the month to see how I like it, but I think it will be a good substitute.