Can’t sleep laying flat down?

Is there a position I can sleep to alleviate back pain? Laying flat down doesn't work, and a recliner chair is "ok" but still hurts some. Any ideas?

I'm 21 yrs old and my back always hurts pretty much 24-7. I've been to the doc but seeing more advice. Anyways, I can't sleep laying down, nor stand up for long periods of time, or do certain weight lifting exercises.

My back ALWAYS feels tight and needs t obe stretched / cracked...Why is this?
Thank you all.
The doctor said it was "Sherman's disease" and "hamstring tightness."

=( I've been stretching a lot. Thanks again