My Hubby has back problems in the small curve of his back... per his Doc... take Advil or an anti-inflammatory pill. There is also prescription...
Next, the "Phiten Titanium" patches also helps too... athletes use it too.
Then, he applies cold packs, then warm packs to his back.
Then, I also massage his back... using Tiger balm.
Sitting... is actually very straining on the back. I suggest instead, using a BIG exercise ball, to sit on... much better. Actually very comfortable
Next, be VERY careful of what back exercises you do... because, for some, doing curved back exercises will make it worse. ie: cat arching of the back while on your hands/knees, or curling up into a ball type exercises.
For others, doing exercises that are arched in the opposite direction is worse. ie: laying on stomach and lifting up your upper torso via your hands/arms so that your back arches backward.
Depending on what is wrong with your back... then you would do the specific exercises.... or not.
Using anti-inflammatory like Advil is important... otherwise the inflammation causes friction on your nerves etc. Making it worse.
Also, just resting.
Or use a back brace to provide support.
good luck,
Susan