Thank you for comments, my back is much better today, getting out for a short walk in the morning and again in the afternoon (even if it was just around the supermarket) helped a lot. Walking does hurt, but is infinitely better than just sitting down all day - the walking loosens everything up, whereas sitting makes me more fixed and ultimately much more sore.
Wherethejourneytakesme asked if it's a condition that comes and goes - yes. I had a slipped disc in my lower back when I was 19 (I did it playing tennis with a friend....see, sports are dangerous, hence why I never do them hahaha!), I've had lower back trouble on and off ever since. I've had numerous courses of physiotherapy, osteopathy and chiropractic over the years, both NHS and private, even tried acupuncture and yoga. They all work to ease the condition at the time, but of course it comes back again when I forget to bend correctly, or stand in one position too long, or reach up to grab something...or it just happens for no particular reason! I do have long periods when I'm pain free, although they tend to be shorter as I get older.
Normally, ibuprofen and paracetamol take care of it, but if it's particularly bad or shows no signs of going, then I have anti-inflammatories and muscle relaxants from the GP. Fortunately, I haven't needed them this time.
Today I'm doing a freezer and larder inventory - I'll stand on a small footstool for the higher shelves and sit on a chair for the lower, so I don't have to reach up or bend down. There are some spaces appearing in the freezer....if I rearranged it all (which I won't be doing right now!) I reckon I'd have 2 empty drawers in the tall freezer. Then I'll do a menu plan for the week and shopping list, again I don't think we'll need much.