I've stayed off the bike for a couple of days. Did a bit of walking, and found that the first half of the walk was amazingly refreshing (we've had rain and cool weather). Then, I start sweating like a stuck pig during the second half, and when I get home I'm exhausted.
So I'm taking it easy. It's now been three days, and I feel (knock wood) like the worst may be behind me. Having said that, and angered the Head Cold Gods, I may be in for another rocky period.
