The stuff nightmares are made of

This bed started off great. The old mattress caused knots in my upper back and this mattress seemed like a vast improvement. However, after 8 months, this bed became my nightmare. It is sunken in where I lay, any Support it had is gone! I wake up with so much pain in my lower back everyday. I’m not huge btw. I weigh less than 150lbs. I hate it. I just replaced it. Now I’m stuck with this stupid mattress because I don’t want to throw it away! It’s still brand new! I’m giving it to my 18 year old son. He’s young enough that it hopefully won’t hurt him