HH:
I herniated L5-S1 over ten years ago now. It was a major blow out. I couldn't stand up straight for over 4 weeks! I permanently lost the nerve reflex in my right ankle and my right leg was numb along the sciatic nerve for months. The morphine was...interesting, though.
I was in a hurry to get better, so I pushed things too much. I wouldn't make this same mistake, if I were you. Go slow and easy and you'll likely be back into training sooner and more fully than if you push it too much and suffer aggravations of your back injury.
One of the most useful rehab practices that I did was simply walking - alot. Oh, and I have found planking to be a marvelous way to stabilize my core without aggravating my old back injury. I would recommend planking over crunches and hyperextensions any day!
I have had to modify things in training somewhat. I can't go slam bang on the mats all the time like I once did. But, I can still train well, nevertheless.
You have my sincerest sympathy. I hope your recovery goes well.