I got to the doctor's yesterday, and she prescribed ear drops. They're great! After just 24 hours of treatment, I woke up this morning without thinking, "Eek! I need a pain killer RIGHT NOW!" In fact, I've only had one painkiller all morning.
With a bit of luck the brain fog should start to blow away soon, and I can start dealing with the backlog.
As Mum-in-law used to say,, "I'm better than yesterday and worse than tomorrow."