Go to Ironmind.com and look into their hip squat belt. It's worn in a similiar fashion as a dip belt. You can go heavy with it without loading weight on your back. Also try uni lateral exercises for your legs. Reverse hypers are an amazing exercise also for the posterior chain and help to alleviate a lot of discomfort. When you get back to lifting add in some hangs from a chin bar after every workout.
First and foremost though is find a decent physician and most likely a physical therapist and follow what they say.
I have herniated and degenerated discs in the lumbar and cervical regions of my spine. My Dr. at the time told me to nerver lift again. After much trial and error I am now back to squatting and DL'ing so there's always hope. Just be diligent and smart, most of all listen to your body.
Best of luck bro.