Unfortunately I can’t change the chair at work where I do most of my sitting. I sleep on the floor, as I feel most comfortable there. Also I think it’s my lower spine because while it’s normal to have one leg slightly longer, my left leg is almost an inch or more so. I believe my spine is not in complete alignment.
I started not using chair backs, ala stools for my art table, and feel so much better. I am thinking of trying a standing art table eventually.