1 step forward then 2 back

The tooth is out, but the chesty cough has come back. After a long day sitting I wanted to do some practice tonight, but the last couple of days have taken more out of me than I realised. Standing were not great, my hamstrings seem to lose inches with an enforced day off, I got as far as Marichyasana A, then thought better of it, did some rubbish backbends and stopped, well actually I came down from a 2 breath UD straight into Savasana.

How can I go from a good shala practice on Sunday to a virtual wipe out practice on Tuesday, I only had a tooth extracted, maybe there are untold stresses on the body, maybe adrenaline took me through Sunday or perhaps my body is still trying to catch up from nearly 3 weeks of sleep deprivation.