Why is it??

That I ran a half marathon 1 1/2 weeks ago, and I was terrified to run 4 miles today. And even more - why were those 4 miles SO HARD!!! I swear, I was so close to stopping today because running just exhausted me. I did realize after I finished that at about 2 1/2 miles I increased the incline. I was so exhausted that I pushed the incline down just to make sure I wasn't on an incline - well, my brain must have been exhausted too, because instead of pushing down, I pushed up. It wasn't THAT much of a difference, because it was only up 1 or 2 levels, so like 2.5%, but it helps me feel a little better about the run being so hard. So I'm planning on running 6 miles on Saturday. I'm hoping it's a little easier than today was. I'm tempted to cut it down to 5, but you know me - I'm a slave to my schedule, even if I did create this schedule. I think my muscles are tired, so I'll rest them tomorrow & do weights instead, and hopefully that will help.
Anyway, as for the rest of my midweek check in. It's going good so far. I ran 2 miles Mon. and walked an extra 1 1/2 miles. Yesterday I ran 2 miles and did weights, and today 4.
I've been doing good on my eating, and having more fruit this week. I really notice a difference when I eat more fruit. I need to keep up on that.
The area I need to improve the most is still sleep. I'm SO tired, because I stay up too late just trying to get a little alone time/ unwind time after going all day.
My leg is still very sore. I stopped taking ibuprofen in the middle of last week, to get an accurate picture of what the pain really was. I've been stretching a ton, and it helps a little, but I think just time will heal it the most. I did take some today because I was really as scared for this 4 miles today, as the first time we did it. And the ibuprofen really helps a lot. I'm going to dinner with some friends on Friday night. I'm going to TRY to eat healthy, but I might weigh in Friday morning just in case I blow it on Friday night.