Burnt out or Over-trained?

So I'm looking for some feedback regarding my race season up to this point.  A little background for this year so far...my two "A" races (only races) have been the Publix Marathon and Gulf Coast.  My goals were to go sub 4hrs for the Publix and sub 5:30 for GC.  I felt like those were reasonable goals considering at last years Publix I did 4:10 with a fair bit of walking, and in my two other 70.3s, I've been sub 5:40.

This year at the Publix I went 4:30, and at Gulf Coast I did 5:40 (which includes a 2:26 "run" split).  I'm disappointed that i didn't hit my goals, but really disappointed that during the races, not only was i physically whipped, but I "checked out" mentally, as in stopped caring and just wanted to be done.  

I'm trying to figure out what is going on.  Am I burnt out?  I guess that would explain the mental "throwing in the towel" during these races.  Over-trained?  I keep thinking back to my peak week training for the Publix where I hit 43 miles.  First time going that high for a week, and I was beat down physically and mentally.  The whole training plan i was following may have been too ambitious.  I don't think I ever really recovered from that before the race.  I wonder if i'm still feeling residual fatigue b/c I haven't had any "snap" in my run in a long, long time.  It always feels like I'm running in sand.

However, I did make some improvements in my bike fitness and swim has stayed about the same, so maybe i'm not over-trained.  maybe its that i'm just burnt out on running.

I'm signed up for IMFL in November, and now I'm worried that I won't have the motivation to train properly for it.  I was also going to do Augusta as a fitness test for IMFL, but that just doesn't sound appealing to me at all right now.  So I need some interwebz wisdom.  What's going on with me?  Should I keep on keeping on, and let things work out?  Should I take time off?  Should I take some HTFU pills and wash it down with a glass of STFU?

Biggsmooth out!