I couldn't agree more. The MRI is vital so that a specialist can determine exactly the route cause. I have had this problem since December 2003, after chiro treatment which only eased some of the pain - and when I had reach the point of endless sleepless nights, no position being a let up - I had an MRI.
I came from a sports, dance background so was used to being very active. You MUST slow down though and rest, it is one of the few things you can do to aid your body's recovery... listen to what it is telling you. My problem was so bad in the end, I opted for a steriod injection into the disc (MAY 2005), something I never thought I would do, but I am so glad I did. It is surprisingly quick and painless and I only suffered a little discovered for a few days but still nothing compared to before I had it.
I am delighted to say that I am now back into moderate exercise and dance, but doing so mindful of the disc... avoiding leverage from the hips bending forward and obviously no weights involved. Plenty of steady and slow stretches.
You can get over this, you just have to allow your body the time and respect to repair. I allowed mine to get to such a point where my whole body and mind was stressed by it, trying to soldier on regardless..... the steroid took away, rapidly, the inflamation surrounding the disc which affected the sciatic nerve so viciously and gave me some breathing space to adjust to the condition.
It will get better just give it time and respect.