3x2 Mile Bust

Goal:
3x2 Mile with 2:00 Rest at 11:30-1:40 (5:45-5:50 pace)

Actual:
4 mile warmup
3x2 mile at:
5:55/5:45 (11:40) 2 min jog rest
6:08/5:57 (12:05) 3 min jog rest
5:56/6:08 (12:04)
1 mile cool down for 11+ miles total

I am really trying to stay positive here, but workouts like this really make me wonder what the hell is going on.  I've been on a strict iron supplementation program for the past four weeks and would expect that I could run 5:45 pace without sucking air.  Well, I can't.  Halfway through the second interval, I fought everything within myself not to stop and walk.  My muscles wanted it, my lungs wanted, and my mind almost wanted it.  But I didn't stop. I made myself push through it until the end, and then I took a longer rest between 2 and 3 so that my breathing could get back under control.

I would say that perhaps I went out too fast, but my first interval was practically all downhill from Mint to Morehead.  Hooray, I can run 5:45 pace going downhill.  I used to be able to run 5:45 pace on flat surface without thinking.  I can't image that it's just my iron that is affecting me right now, but whatever it is, it's not helping my frame of mind.  I've got Army Ten Miler in 9 days and I have no idea how to make a race plan if I don't even know what my body (mind?) can handle right now.  First plan of action is to head into LabCorp later today to get blood work done and see if my iron is finally higher.  If not, then I'll have some reevaluating to do.

The only thing I can think of is that I really need to slow everything down, kind of like what I did before Twin Cities.  For workouts like this, I would start at Marathon Pace for the first interval (6:10, 10k (5:50) pace for the second one, and like 5k-10k pace for the third one (542).