Mattress for back pain?

[MRJones]

Hi all, Im new to this forum and not sure how if it the right place to post this thread. I have been having a lower back pain since february after I fell on black ice. I was having treatment for my back pain for the next 2 months. It was a really bad fall. Then I had regular check ups and the pain was gone. Recently we bought a new mattress @ $260 and the pain started to show action and now I have sleepless nights. I consulted my doctor, who said that the newly bought mattress is the villain for my back pain. I inquired at a local mattress store and they have promised me about giving the best mattress for my back pain. But the question is how do I know if its going to benefit me. I also want to get rid of my old mattress. Any ideas and suggestions? Looking forward to your help!