“Sleeping laying down causes extreme back pain?”

Hello, around 3/4 years ago I was stuck in an airport for a week, so I had to learn to sleep sitting which I could never do previously and this has cause a bad habit to where I can instantly pass out sitting. As it became a normal thing after a while if I was to sleep on a bed, floor anything laying down I have excruciating pain on my entire lower back like its horrible feels tight, spazzing I have to keep both my hands holding my lower back even though I believe that does nothing, if it wakes me in the middle of the night ain't no way I am able to go back to sleep as far as I'm aware this happens no matter how I lay down back, side, stomach it don't matter so I slept sitting down or on a recliner when on the recliner pain is there but very very minor and goes away fairly quickly. Laying down I have no idea how long the pain would last as I can't handle it i take some aspirin and thankfully it works for now. Any idea why this happens? any advice on what i can do? Should I be worried and caused to be professionally looked at? Is it ok to sleep sitting or anything I should be aware of by sleeping that way? I currently have no insurance since I'm between jobs and why I had come here. I hope you could give me some advice to help me till i am able to get covered and see a specialist. I appreciate your time and thank you for what you do.