Painful left knee

Had a good night's sleep.
Woke up with severe pain in my left knee which hasn't gone away today. It could be because it is so cold outside (or even a flare up of the lupus).
The gardener and window cleaners all cancelled (the ground is too cold and hard for the gardener to dig and the water kept freezing for the window cleaners).
I haven't done much today because my left knee is so painful and I couldn't even go outside because I wouldn't be able to breathe properly.
I am looking forward to tomorrow as it is a new day.