Blisters !!!

I had a nice 7 mile run yesterday before my hard heavy hitting training this week. I struggle like no tommorrow. It was one of my group runs, but I ran out of gas so quick. My heart rate is always at a good rate never goes above 160. I can't figure it out... why am I so out of gas. This week was a bit crazy, so starting off a run taking motrin ahead of time isn't a good sign. Than after my run, I look at my foot.... a huge red blister. I never get them. I was kind of shocked, but it wasn't to bad. Than I realized, wait why is my insert sitting by the door. I ran with no sole or insert on my run. Man I must have been tired when I left the house. Not going to do that anymore. Today I don't feel sore just tired, I think my iron levels are in low again, really effects my performance alot. Even with run yesterday my average heart rate was 145, why I burnt out of gas way to quick (even my first mile) Let see how this week goes.