I feel your pain. Literally, the sciatica and regret about not being able to sit and write for an 8 hour stretch. I also now sit and stand - my problem w chairs is Im 5’1” and so I got a what they call “size A” chair for shortys but after 4 years it no longer “fits” my aching spinal disks. Funny though- my back finally stopped hurting when I sat for an hour in the dentist’s chair 😆😆 Truth!