Hi, youre pain sounRAB very similar to what I recently had. I had severe lower back pain deep inside the spine, bad muscles spasms radiating out to each side, severe nerve pains that radiated into both hips and groin area. It was as if my upper body was placed onto my hips and was crushing it or something. However, I did not have the pain in my heels. I did not go see my doc for it, but I knew from experience it must be one or more herniations. Thankfully it seems to have shrunk back on its own and I no longer have that horrible nerve pain, and no more spasms. I have some pain in my hips, but it's little and bearable (though it still bothers me if I walk around too long...but it was like this before the herniations).
Now before this happened, I had heriations back in March (large herniations in L3-L4 and L4-L5 and bulges in L1-L2 and L5-S1), turned out my nerve pain back then was coming from L5 b/c the nerve block at L5 worked. So maybe one of these reherniated again or maybe one of the bulges from then herniated this time.
If you have had no luck with meRAB or injections, I would also suggest you get another opionion. If you are in that much pain, something sure is causing it.