Thank you bridget! I spoke to my boss this afternoon, who agreed I should take tomorrow and Wednesday off (tomorrow was a day off anyway, but I would have been working Wednesday). I then have Thursday off, so hopefully will be fit by then for work on Christmas Day. She would rather I take enough time and get better rather than rush back and then go off sick again.
Meanwhile, I have been taking it easy today and taking Ibuprofen for pain relief and to ease the inflammation. 