Never ending fatigue? Will this ever end? How about daily running??

 I'm getting slower and slower.  I don't know why

I stopped to walk over 15 times in three miles today.  My HR went up to 130+ quickly after I would start walking again.  I cannot seem to run at all without a high breathing rate.  I'm hoping that this will all come back - eventually - but it's discouraging to keep running slower and slower.  

you can see all of the walk breaks I took from the very start.  Even now - at 6 pm today i'm very tired, my eyes are dry/sore, I've felt light headed the entire day.