I am an active 28 year old Male, a little over a year ago I tore my ACL in my left knee. About 6 months or so after my knee injury (not sure if there related) I began to have lower back pain. The pain is mostly in the lower third of my back and varies on the degree of pain. Some times I feel like it is on either side of my spine and sometimes it feals like it is my spine itself. No area is tender to the touch. When it flares up it is excruciating and lasts usually for a week or so and when its not at its worst it is still bothersome and nagging. Sitting for prolonged periods of times or lying on my back makes the pain unbearable at times, lying on my side with a pillow between my knees is the only way I can lay comfortably. My first step was to go to my GP and she though it was a muscle strain and subscribed me muscle relaxers (which did nothing) and referred me to physical therapy which I did for a month or so and felt no better. After PT I took matters into my own hands and went to a chiropractor for a little over a month with no results and the same with acupuncture. I went to a specialist and got an x-ray and MRI, but they both came back completely normal. The only thing of note was that I don’t have as pronounced of a curve in my lumbar as normal but nothing that should be causing me this pain. The specialist concluded that it must me muscular and recommended more physical therapy and a reevaluation in a couple months. A heating pad seems to help subdue the pain but only briefly. The same can be said for stretches and exercises I learned from PT and various internet resources. The only time in the past 7 or 8 months I have been completely without pain was a couple weeks in November 2014 after I finally had my ACL surgery when I was on pain medication (oxycodone) for the surgery. At this point I get so frustrated with the pain that my mood and attitude are effected and when my MRI came back normal I was heart broken because I just want to know what is causing the pain and to know that I am at least treating the right thing and there is an end in sight. Any advice or relatable stories would be appreciated.