I had a Heavy Cold that Started off in my head and then went to my chest the week before the Brighton Half. On the day of the Half it was so bad I had to pull out of the race. So I signed up for the Eastbourne half a week later. On the Monday I went to the Doctors And Asked for Antibiotics. He said they may not work if its a virus. But if its bacterial it will. So I took them and started to feel a lot better within 2-3 days.
Although I was still coughing up stuff I was able to run the race and ran 1.32.(Was hoping for 1.29) And its quite a hilly at the start.
I would say Rest up as this is your body trying to tell you too. You wont lose any fitness in a few days.
Trouble is with us obseesives is that we ignore our bodies .
All you lot talking about your 18 mile MP runs at 2.11 and 2.06 etc puts me to shame. I only managed 10 miles yesterday with 4 @ MP. As my shin splints flare up every time I do either a Tempo or speed work.
I will be doing all my runs now on grass and at easy pace so no sharpening up.