I have had lower back pain for many years but it is definitely attached to my IBS now. In the morning before a bm, it is really bad. It's OK when I first get up and am brushing my teeth etc, but when I go downstairs and get moving it really hurts. It is a relief when I have to go to the toilet and can sit on the seat with my knees up a bit (slightly "squatty-potty"😉 Phew, the pain is easier as soon as I sit like that.
Then when I'm done I noticed that the pain eases up a lot and I am not too bad for the rest of the day, and moving around, exercise etc.
My back is not good. I have a twisted pelvis and some slight scoliosis of the spine. I often wonder if that has triggered ibs for me.
Washing up dishes hurts too, to one degree or another, so I understand what you mean.
I put some Deep Heat rub on my back and sacral area at the back and that does help. But of course it doesn't cure, it just eases up the muscle and ligament spasms. Warm baths are glorious! Cold weather and damp weather make it worse. I always make sure to keep my lower back well wrapped up.