I had a lots of tests done, 2 major spinal fusions, but discogram is the worse test I ever had.
They say that worse your problems - more pain you are in after. So I was ready for this. It took me up to my surgery, 3 weeks, of agony after the discogram. I couldn't step on my legs to get to the bathroom that how painful this was.
Sciatica pain was worse than ever for 3 weeks.
So my heart goes out to you, sweet heart. I used a lots of ice: 20 minutes on, 20 off. PK and rest. Nothing else you can do at this point.
My friend had this done and he had not much pain at all after the discogram. But he also recieved good news that nothing serious is going on with his spine and no surgery needed.
Best of luck to you and speedy recovery!