Anyone else experience this ??

OKAY SO RANDOM, i’ve always known i’ve had this problem but i just decided maybe i should look into it? I have gone to a chiropractor since 8th grade because of crippling lower back pain, i am now 18. there’s a specific aspect that’s been bothering me since i started yoga, i cannot lay flat on my back without A LOT of pain in my tailbone and arch of my back. the mid of my back does not touch the ground and it feels like it’s heavily arched, and all the pressure goes to my tailbone making it hurt so baddd. and weird but sometimes when i clench my muscles in my butt it pops something back into place. I’m asking on here just to see if anyone has went through anything similar!