Back problems help me out here?

Hey guys I've been having back problems for a while. I'm a 15 year old that was in football till I had to check out my back. I had an MRI for it and the doctor told me the 4th lumbar is disintegrating and I could possibly need surgery. I've gone to physical therapy for 3 weeks and I have been doing the workouts that were given to me. My back is still in a little pain. Are there any other exercises that can stabilize my back again? And since my football career is over, are there any other sports that I could do? Thanks!