Talk to General Physician on Lower Back Pain

Assalam o alaikum wrwb

I'm male, 33 years of age. I've lower back pain since 2020 and it keeps on coming back on and off. The pain is around coccyx (tail bone) area. It all started during April 2020 when lockdown started and we had to work from home. I sat for 7-8 hours on my bed using laptop when this pain started and till to date it's difficult for me to sit without backrest on any chair or stool. Even if i sit without backrest, it starts paining. I can't bend while washing my face or doing wuzu on wash basin. I've to bend using my knees. I did consult many doctors but they only gave pain killers. I've somehow learnt to live with this pain but sometimes it gets very difficult and unbearable. I've even bought coccyx cushion, still it's of no use. -_-

I've been using different stretches, yoga poses for strengthening my lower back muscles but everything has ended up in vain. I need a permanent solution to this pain of mine. Please suggest, which doctor should i consult..? Any orthoped