Back Pain Support Group
Back pain is one of the most common reasons people seek medical care. In fact, about 3 in 4 adults will experience back pain during their lifetime! The term back pain includes pain affecting the neck, midback and low back. Acute back pain may begin suddenly with intense pain but typically lasts fewer than three months. Usually, chronic back pain is persistent, steady, and...

The only thing that is going to fix your problem at this time is a fusion like the Doc mention.... You can try to put it off until you can handle it financially with PT, walking, swimming, yoga, medications, injections, etc. but it is going to come down to having the fusion.
I hope that you can control the pain long enough, I've been through a 3 level/360 lumbar fusion, so I know why you want to be ready in order to have it done.... Take care,