Posted: 02/06/2016 at 17:22
Your OP is a very similar story to me. I have a chest infection at the mo and have had it for 3 weeks, but when this is cleared I am going back to HADD training. Low heart rate work to start with, build up nice and slowly.
It all came to a head 3 weeks ago when I ran my worst half marathon ever, I now know why.